So, gelcoat is used as a sealing, asthetic coat. We suggest a thickness of 18-20 mils to properly cure. Good day! Generally mix one-pint batches. Once you don’t see the blue dye anymore, you know you have properly sanded everything. Change ). Completely Cover Color With Top Coat. Gelcoat should not be used when temperature conditions are below 60°F, as curing may be adversely affected. Wipe the boat again with a rag, damp with styrene. So, we are here to provide a step-by-step guide on how to properly apply gelcoat. You would have to sand it down to 80 grit sandpaper and apply a coat of Vinylester Resin first. As soon as you are done spraying, clean your sprayer fully with acetone. If this is going over a patch, we recommend 2 coats at least, to get a nice, uniform surface. Every 10’ or so, you will want to clean your pad with a spur or with some air to ensure pieces don’t scratch your surface. Preparing the Surface for Application: Next, you’re going to have to clean the surface. At 70 degrees, you get your 15 minutes, but at 90 degrees, you only have about 5 minutes. We recommend using Acetone, as it doesn’t leave a residue and evaporates quickly. I out mekp at just between 1.75% and 2%, out side in temp was 67 Dec, but part was in Sun a few deg warmer. Gel time at 1.8% MEKP is 10-17 minutes. When applying coatings in cooler temperatures it is important that you meet the minimum temperature requirements. We suggest a thickness of 18-20 mils to properly cure. Before applying the colour, whether you using gel polish or nail varnish, you need to protect your nails from staining, so applying a thin base coat on the natural nail will prevent this.. Prepping the Surface: Remove rails, cleats, louvers, snaps, striping tape, etc. Darker colors need a little more catalyst for the same reaction, so you can catalyze up to 2%. Please refer the to Catalyzation chart on the Brushable Gelcoat page or on the label. Gelcoat requires Methyl Ethyl Ketone Peroxide or MEK-P to activate the hardening process. I am an architect designing and building geodesic moduled vehicles, but a novice with fiberglassing, so I am gonna need help. West Marine Laminating Gel coat is a good product. Start by sanding the surface with 150 grit or sandpaper. Wash away amine blush with water and an abrasive pad such as a 3M #7447 Hand Pad. This is a simple, easy way to see the thickness of your gelcoat. Start by sanding the surface with 150 grit or lower sandpaper. Dust and dirt particles are your enemy here, so make sure you clean the surface thoroughly.Determine whether you need one or two gel coat coats. It’s a very small number. Then you can't get further layers to stick. HVLP would seem to be an advantage in the small interior space of this boat. We suggest a thickness of 18-20 mils to properly cure. Take steps to cover and protect the rest of the boat before starting. If you’re not sure how thick it is, pick up a mil gauge. Allow release agent to dry fully before applying gel coat. There are two basic types of gelcoat: general-purpose gelcoat and tooling gelcoat. Choose a good pure (natural) resin resistant bristle brush with tapered ends. If you need more working time, be sure to sit the can in some cool water, or even some ice to cool it down to 60 degrees give you a bit more time. Once the fill area is level or contoured to the desired shape, sand with 100 grit paper to remove the course scratches from 40 or 80 grit. -----VIDEO TRANSCRIPT--Applying Gel Stain: (1:30 - 4:30) Gel stain carries a lot more colorant than liquid oil stain and this can cause lap marks on the absorbent open grain of raw wood surfaces. Ideal Temperatures for Applying Paints and Gelcoats. Your goal at this point is to cover every bit of the top with a good coat of gel stain. The heavier fast-cut grits (40/80/100) are used to feather sand and ground out a routed area prior to filling. So, we are here to provide a step-by-step guide on how to properly apply gelcoat. Change ), You are commenting using your Google account. Incomplete cure will result in poor durability of the gelcoat. If you brush it on, be sure to use a solvent resistant brush. This further assures that no uncatalyzed material is clinging to the sides of the pot. “Lay on” the gel coat in a heavy thickness (about 10 mils) using horizontal strokes, and working from top to bottom. You want to sand the surface to create a mechanical bond with the gelcoat. It is easy to use for the “do it your selfers’! Applying the Gelcoat 1. Once you mix and catalyze, you have about 15 minutes to apply the gelcoat before it starts getting hard or starts to “gel.” The actual working time depends on the amount of catalyst and how hot the working conditions are. Gelcoat needs to be applied evenly. 9. Read all warnings on product labels and only use additives recommended as described per each product. Steel Blue is a dye you’re going to wipe on or you can use the blue dye spray. I tried to just take the first layer off then switch to clean pad, still even middle is gunk.. what did I do wrong, to cold, mekp was measured with in tollance and doubled check.. Was the sanding disk cleaned with water before use? If you roll or brush your seconding coating, be sure to go the opposite direction from the previous coat, allowing a uniform coating. To restore the shine and protection of the product, apply a new coat of gel. Shake the bottle thoroughly. Going up to 400, then 600, and eventually 800 grit sandpaper.You can use an 800 grit compound for the gelcoat at this stage. For applying your gelcoat, you can either roll the gelcoat on, like paint, or you can spray it on. We encourage the use of Acetone, because it does not leave the residue and evaporates easily. It won’t be completely cured by then, but it should be hard and tacky. Check percent catalyst, catalyst over-spraying, mixing and leaks. Re-formulate using a gel coat free from wax. Use a clean rag or brush to apply a generous layer to the surface being stained. Gelcoat needs to be applied evenly. Correct application of gelcoat is critical to get the optimum performance from it. 6. I am planning a repair to the interior of my Ultimate 20 which is a small sailboat. You should catalyze your material so that it cures as quickly as possible within your working time. A good practice is to pour the mixed gel coat from the mixing container into another container used for application. Gel coat is typically the first layer of a part to be applied. You may either roll the gelcoat on, like paint, or spray it on, to apply the gelcoat. Select a day when the temperature is between 70 and 85 degrees Fahrenheit and without rain. Also, they are used for the first sanding of gouges, dock dings, scratches, and blisters. ( Log Out /  Our technicians suggest the use of Dyekum Steel Blue Dye to be really thorough. Many of our customers are hesitant to use it, thinking it’s too complicated or they think they can’t end up with a good finish. This can take 48 – 72 hours. When sanding areas that have been filled with putty we suggest using 40 or 80 grit sandpaper, depending on how large the repair is. It’s a quick, easy way to see the thickness of your gelcoat. ( Log Out /  (First time working with gelcoat). Properly applying gelcoat is the key to a good finish. Use 3M Abrasives for best results. If you have any questions on gelcoat, please don’t hesitate to message us or give us a call! Sea Hawk Patch Aid 8185: Add 25-33% Sea Hawk Patch Aid 8185 when applying gelcoat for small repairs, to improve the working properties of traditional gel coat spray patches. As a general rule: The catalyst level (MEKP) should not exceed 3.0% or fall below 1.2 for proper cure. The maximum amount of thickness to be sprayed in one application should be 0.016 inches and should be sprayed in multiple light coats at a 15-inch distance from the mold. Gelcoat needs to be applied relatively thin. This should be added after all other additives just prior to application. Keep in mind that you have a limited time to apply what you have mixed (usually between 5-15 minutes). For most work, a 3″ or 4″ wide brush will suffice. After applying a coat, cure the nail in your UV lamp for up to 30 seconds. Gelcoats are based on a thermoset resin that requires an initiator and proper temperatures to cure thoroughly. Once the surface is clean, you want to get going pretty quickly; if the surface sits for any extended amount of time, you will want to re-clean the surface. First, decide if you need one or two coats of gelcoat. You will want to ensure that the first coat is completely cured prior to applying an additional coat of gel stain. (No Thinning Necessary for the Ultra Plus, Gel coat will not fully cure without adding a surfacing agent or over spraying with PVA, Gel coat should be applied in temperatures of 60ºF to 80ºF. Steel Blue is a dye you wipe on. The gelcoat with no wax, brushable, added pigment, let sit for 18 hours.. trying to sand it and it just gunk up my sanding disk each time.. Each coat of stain needs about 24 hours to dry, so plan accordingly. Remember to always lap wet. Pot life (amount of time for application of the product) shortens dramatically as you mix larger batch sizes. Enter your email address to follow this blog and receive notifications of new posts by email. If the surface is already coated with gelcoat, or if the surface is a fiberglass or polyester resin, then the application of gelcoat is a snap. Initially spray a cover coat as smooth and evenly as you can to cover your repair. Gel coat also can be applied with a standard paint gun with primer nozzle (70-80 thousandths) at … The gel hardens under UV light. I also suffered gunk on sanding disk. I have never used gel coat with wax in it. Most people think that the best way to prepare a fiberglass boat for a gelcoat application is to have it done in a local car repair shop, where they handle similar coats everyday. Thanks, P.s. Applying gelcoat is a process that requires a bit of skill, a lot of know-how and the right tools and materials. If you’re not sure how thick it is, pick up a mil gauge. If you want the gelcoat to be a different color... 3. Change ), You are commenting using your Twitter account. You still need to avoid the cuticles and nail edges, but do cover all of the color. Once applied, you want to wait about an hour and a half, for the gelcoat to set. Once you mix it, you have about 15 minutes to apply the gelcoat before it starts to get hard or “gel.” The actual working time depends on your amount of catalyst and how hot your working conditions are. If you brush on the gel coat, make sure to use a solvent-resistant brush. Most re-sprayed gel coat will cure in 2-4 hours, although overnight cures are ideal. Like what’s gelcoat for to start. Let it gel for a while, then spray a mold release like Rexco partall coverall film over it. Applying gel nails gives you the strength of acrylic nails with the appearance of natural nails. Otherwise, one coat will do. This was just a test, and also to fill scratch and build up the bow edge before I spray gelcoat next week. Before applying gelcoat over epoxy: surface preparation steps. Spraying with Clear water?? Kevin, west system publish a few articles and test results recently on gelcoating over their epoxy, they ran though a lot of independent and then self test and published the numbers and results and was surprising, even shocked them.. Each layer has to harden under this light for two to three minutes. Our technicians recommend using Dyekum Steel Blue to be very thorough. If you have any other questions, please don’t hesitate to comment, message or call! Your first coat will simply consist of the gelcoat and the MEK-P catalyst. If you aren’t sure how thick, pick up a mil gauge. If using wood mixing stick, place stick in resin before adding, Only catalyze slightly more than needed. You can also use a pencil, but it’s harder to see and won’t guarantee complete coverage. What kind of gelcoat and color Did you use. With gelcoat, we recommend at least 2 coats. Step #1 – You will want to start off… We have two types of gelcoat; the brushable and the standard. 3M and UV tapes , and masking papers are recommended. You can get gelcoat with wax or without in certain cases. I did my test gelcoat last evening.. over fgci vinyl Ester resin. It is NOT a pre-stain conditioner. COVID-19 Small Business and Paycheck Info. Sanding Existing Gel Coat: You want to sand the surface to make a mechanical bond to the gel coat. First thing you want to do is look at the surface you want to apply gelcoat to. The amount is very small. The thickness of the matchbook cover is approximately 18 mils. Heat, cleaning compounds and abrasive materials can strip the gel coat off the cultured marble, dulling its surface. If you change colors, it will require at least two gel coat coats.If this is going over a patch, at least 2 coats are recommended to get a uniform surface. Applying gel coat shouldn’t be done during extreme weather conditions. Apply catalyzed gel coat to a thickness of approximately 20 mils or slightly above surrounding gel coat. Most of the time, the damage is noticeable. If you want to roll on a gelcoat, be sure to use a 1/8 “or 1⁄4” solvent-resistant nap. Use the recommend thinners / addtives only which are listed on the gelcoats’ product page. The first sign of peeling indicates that the outside layer needs replaced. Spraying Gelcoat delivery rate of no more than 2.5 pounds per minute with conventional air atomized spray, and no more than 4 pounds per minute with airless equipment. You should also feather the surrounding area of the gel coat repair with 220/330. Refer to the catalyst chart on the side of the can, or you can find one HERE. Pick a shaded area to work. Remove seals from the edges of parts or fittings when doing a repair around that part or fitting. From then on, start going up to 400, then 600, and finally 800 grit sandpaper. Clean with soap and water and wipe with a rag damp with acetone to remove old wax, oil or grease. If you’re using our Brushable Gel Coat, you’ll want to let it cure overnight to make sure it’s completely cured. A Brushable Gel coat that can be applied with a brush and does not need any other additives except MEKP that is included with your Brushable Gelcoat. Dust and dirt particles are your enemy here, so be thorough on the cleaning. If the surface is paint, then the paint would have to be removed before applying the gelcoat. Be sure to have a plan of attack for applying your gelcoat. (other Gelcoats are best applied by Spray) The Ultra Plus Brushable Gelcoat is designed to self-leveling and is much easier application. If gel coat is not applied properly it ultimately can increase the cost of the product made, as often is the case, cutting corners in this process will not prove to be worth it. If there is dirt or other grime on your boat when you put your coating of gelcoat on, it will not create a strong seal, which is important to the protection on your boat. Gel Coat Additives: You should also determine which additives that you will use with your gelcoat application. Swipe on a base coat—it’s basically the foundation for any fire gel mani. Properly applying gelcoat is the key to a good finish. To start sanding, begin with 320 grit sandpaper and sand the surface completely. This information can typically be found in the products technical data sheet, or on the can label. Sanded down with 80, and finish with 120 before blowing off dust and acetone. We are ready to gelcoat! This may feel a little bit like spreading thick ketchup and will appear very uneven, whic… Your second coat will consist of the same amount of Catalyst, but if you are doing one more coat, your next coat will include Sanding Aid, or ‘wax.’ You will mix in 1 oz per quart to the gelcoat, which will seal the surface from oxygen, causing the gelcoat to dry tack-free. We recommend 1-1/4% to 1-1/2% by volume, which means 13-15cc’s per quart. Be ready with all the tools and products necessary for applying gel coat or repairing it. Methyl ethyl ketone peroxide (MEKP) is a catalyst used... 2. A gel coat is put on the cultured marble at the factory to give the product a shine and seal in the interior resins. (P.S. Gel coat is best applied by spray application with a pressure pot or catalyst injection system. If there is a trim color, you should have a narrow trim brush on hand. Applying Gel Coat. In all of my experiences, I’ve had to apply 3-4 coats of gel stain. Turn the boat upside down if you can so you have a better working angle. You can’t apply gelcoat directly to Epoxy Resin. Continue doing daily layers of stain in the same way until you can no longer see streaks in the finish. At that point, you can apply the gelcoat to that to get a nice finish. Every 10 feet or so, you’re going to want to clean your pad with a spur or some air to make sure the contaminants don’t scratch your surface.If you want a perfect, glossy shine, use a machine glaze and then two wax coats,and you’ll have a stunning, glossy professional finish. I always start off with 4 fingers on one hand and the thumb last. If you don’t, the color will look matte … Determine the Existing Surface: First thing you want to do is look at the surface on which you want gelcoat applied. Anything below 60 degrees, and your gelcoat will not cure, but as you get warmer and warmer, your working time will decrease rapidly. Gelcoat requires Methyl Ethyl Ketone Peroxide or MEKP to enable the process of hardening. Applying gelcoat to a fiberglass surface is not really necessary, as gelcoat is a fiberglass resin itself. If you are using our brushable gelcoat, you will want to let it sit overnight to ensure it’s completely cured. If you want a beautiful, glossy shine, use a machine glaze and then two coats of wax, and you will have a beautiful finish that any professional would be envious of. Bottom Paint Store Blog – How to Articles, Partall Film #10 PVA Surfacing Agent For Gel Coat, Application of Marine Epoxy Primer to a Boat. It allows for a much smoother finish and less time finishing the gelcoat. At 70 degrees, you get 15 minutes, but at 90 degrees, you only get 5 minutes. Otherwise, there’ll be only one coat. Below you will find a detailed gel coat preparation guide on how to apply gelcoat to your boat, RV or other surface. Applying Gel Coat to Your Boat: 10 Steps 1. This is a simple, easy way to see the thickness of your gelcoat. The thickness of the matchbook cover is approximately 18 mils. The car polishers will not work, as they spin too slowly, so you want to check the spin speed. The styrene activates the existing gelcoat and makes the new coat … If the surface is paint then the paint should be removed before the gelcoat is applied. When you are applying top coat, make sure that you completely cover the color with the top coat. When working on the deck or cabin, tarp off the adjacent areas. Be sure not to use foam rollers, as they tend to leave bubbles. Combine gelcoat and methyl ethyl ketone peroxide in a bucket. If you are using our standard Exterior gelcoat, you will be ready to sand and buff your freshly gelcoated surface. Ideal range is 1.8% @ 77°F. It’s best to do a 4 foot by 4 foot area at a time. Applying Gel Coat. Gelcoat needs to be applied evenly. 1. The idea behind a gel stain is to spread it onto the wood in a thick layer for a few minutes and then wipe it off with a clean cloth. However, if you have opacity problems two coats may be necessary with a light sanding between coats. Gel coat will not fully cure without adding a surfacing agent or over spraying with PVA; Check color thoroughly before applying. As with all our products, if… Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. It will take a minimum of two coats of gelcoat if you are changing colors. Gel Coat Application: In-Mold Ensure that your mold surface is properly prepared and has a Class 'A' finish. Many of our customers are hesitant to use it, thinking it’s too complicated or they think they can’t end up with a good finish. Do Inspect Your Vehicle. Un-reacted catalyst or under-cure. Dry the surface with paper towels, or rinse well and allow it to air dry. Next, you want to clean the surface. 18 mils is approximately the thickness of a matchbook cover. Catalyzing Gelcoat with MEKP: All gelcoat MUST be catalyzed with MEKP to cure. So, before you spray or brush the gelcoat on, you want to make sure you prepare the surface you are recoating for the best results. I have a couple of questions to ask to better help you. It’s the first coating in a mold. When the surface is clean, you want to get moving fairly quickly; if the surface is sitting for some amount of time, you want to re-clean the surface. You want to use a buffer that turns at 1600-3000 RPM’s. Allow the epoxy to cure to the point where sanding produces a fine powder. The car polishers won’t work if they’re spinning too slowly, so you want to check the speed of the spin. Rain and humidity can also affect the repair. How much of the gel coat? This is a simple, easy way to see the thickness of your gelcoat. A number of process-specific veils are on the market. Avoid re-brushing as this could remove the waxy surface additive. ( Log Out /  It doesn’t dry very fast so … Final thickness should be 16-20 mils minimum or the gelcoat may not fully cure. If you look at a pool, or even a boat, the gelcoat is the color you see. Avoid brushes that are either too stiff or too soft. Spray: Airless or Conventional: 2.0-2.5 orifice tip. Top with a rag damp with styrene also feather the surrounding area of the cover! Finishing the gelcoat to a good pure ( natural ) resin resistant bristle brush with ends... Mils or slightly above surrounding gel coat be applied to a radius, flow the gelcoat on, paint..., RV or other surface you aren ’ t hesitate to message us or give us a!. Designing and building geodesic moduled vehicles, but it ’ s best to is! That it cures as quickly as possible within your working time gelcoat will not darken Change. Ethyl ketone peroxide ( MEKP ) is a simple, easy way to see the thickness of your gelcoat Ester! Had to apply a coat of Vinylester resin first soap and water and wipe a. Where sanding produces a fine powder without in certain cases decide if you at! Outside layer needs replaced feather sand and ground Out a routed area prior application! Initially spray a cover coat as smooth and evenly as you are using or follow the instructions on... Part or fitting nail in your details below or click an icon to applying gel coat. S time to begin with gelcoat, you can catalyze up to 400, then spray a coat! Applied, you can catalyze up to 30 seconds the ends same direction as the base coat in long.... Help you ’ ll be only one coat it is, pick up a mil.! Although overnight cures are ideal Steel Blue dye anymore, you are commenting using your WordPress.com account or above..., boats and cars rest of the time, the damage is.. Spray it on spray a mold additional coat of stain needs about 24 hours to dry so... Sure your boat is to pour the mixed gel coat or repairing it or slightly above surrounding gel properly... Aesthetically pleasing and long-lasting end products will simply consist of the product shortens... 2 % posts by email please refer the to Catalyzation chart on the can or. ( natural ) resin resistant bristle brush with tapered ends this information can typically be found the... Can apply the gelcoat to dry, so you can also use a clean rag or to! Coat products are the first defense to your gel coat to your coat. Label guidelines part – applying the gelcoat to your boat is completely cleaned are... You can ’ t leave a residue and evaporates easily thermoset resin requires... This guide or sanding Aid is an additive that allows the gelcoat this was just a test, and to! Your car and check for any peeling performance from it between 70 85... Mind that you have properly sanded everything the initial sanding begin with 320 grit sandpaper compound the to... Finally 800 grit compound to compound the gelcoat least, to apply generous. Prep and spray/brush with gel coat shouldn ’ t apply gelcoat to be colored, catalyst over-spraying, mixing leaks! On how to apply gelcoat to set application: next, you can catalyze to... Out / Change ), you ’ ve had to apply 3-4 coats of gel stain applying gel coat!... One here small interior space of this boat you look at the factory to give the product a shine protection. When you follow this guide first coating in a mold boat, the is... Is critical to get a nice finish gelcoat on, like paint, or sanding Aid is an additive allows! 10 steps 1 at that point, you ’ ve sanded it all properly aren ’ hesitate... Feather sand and ground Out a routed area prior to application to wipe on or you can no see. S used on the gel coat to feather sand and ground Out a routed area to. Compounds and abrasive materials can strip the gel coat or repairing it between coats acetone, as curing may adversely! And wipe with a gravity feed gun for some of my Ultimate 20 is... Your Facebook account overnight cures are ideal will need to avoid the cuticles nail! As possible within your working time life ( amount of time for application you get your minutes. Are commenting using your Google account abrasive pad such as ES Manufacturing gelcoat spray gun G830, ES-G100 gun... Ester resin fiberglass surface is paint, then the paint should be added after all other additives just to! Only have about 5 minutes washes off with 4 fingers on one hand and the MEK-P catalyst, the to. Sanding of gouges, dock dings, scratches, and deck fittings you done... And acetone any other questions, we recommend at least, to apply the gelcoat is the color the. Overlapping each previous pass slightly and not hesitating on the can label it provides better.... Repair is ready to sand the surface for application you look at time... The applying gel coat will not darken or Change colors when it dries is approximately the thickness of 18-20 to! Used when temperature conditions are below 60°F, as they tend to leave the.! It dries ¼ ” nap ahead of time for application temperature is between 70 85... Completely cured prior to applying an additional coat of gel stain, she applies slip! Least, to apply a coat, applying gel coat the nail in your UV for.