If the surface is scratched gelcoat is the same color throughout; if the surface has been painted when scratched it will show what is underneath. If it is just a gouge and not penetrated all the way through the boat, then you would need to fill in the gouge with 3M premium marine filler just one product that will work but our most popular for this use. After you have filled in the gouge and sanded it down, you would then apply the topcoat of gelcoat.
Gelcoat is typically much thicker than a paint and is designed to protect the underlying fiberglass as well as provide a smooth shiny appearance. This will allow you to apply enough gelcoat and be able to feather the surrounding area once your done.
If you leave the marine filler flush, then once you apply the gelcoat you will have a lump on the area you are repairing gelcoat should be thick enough or it could release from repair. Gelcoat or Gelcoat repair Kit. It is most frequently used for new part and mold construction rather than repairs. Coverage will vary depending on application techniques and desired thickness. Typically, however, one gallon of gel coat will cover between square feet at mils.
Since gel coat was designed for in-mold applications, the process is straightforward and relatively simple. Gel coat is usually sprayed into the mold in several thin passes.
After the MEKP hardener is added, there is generally about 20 minutes of working time before the gel coat will begin to harden. Some fabricators like to thin the gel coat before spraying and will add pure liquid styrene also referred to as Styrene Thinner or Monomer to the gel coat.
Gel coat should not be thinned with a solvent such as Acetone because the solvent will break down the molecular chains that the resin is made of and interfere with the properties of the cured gel coat. When a fabricator releases his part from the mold and sees a perfect, glossy gel coat surface, it is a very satisfying moment.
Since the gel coat has been backed by subsequent reinforcement and resin, it can't be seen until it is out of the mold. Gel coat is now part of the final composite. It is not a "coating. In a properly fabricated and cured part, the gel coat should not delaminate nor should the gel coat "chip" off from the surface because it is not a surface coating.
If you are making a polyester or vinyl ester part in a mold, using gel coat is highly recommended as the proper material for the exterior surface. Fibre Glast offers over colors of gel coat for your composite parts. Applying gel coat as a secondary operation as a coating requires some additional considerations.
Since gel coat is polyester resin based and was designed for in-mold use, it will require an air inhibitor in order to properly cure. This additive improves gloss retention and impact resistance, as well as acting as the air inhibitor and thinner. Catalyze the material at 1. Once application is complete, no additional steps are necessary. The wax solution rises to the surface during the curing process and protects the gel coat from the atmosphere. Styrene wax is recommended in conjunction with Duratec Clear Hi-Gloss Gel Coat Additive for applications below the water line or any situation that will be submerged in water.
For a glossy finish, Styrene Wax will need to be sanded off with grit sandpaper once the gel coat has cured. After the sanding has been completed, several coats of polishing wax or compound will create a durable, high-gloss finish. Simply spray the PVA onto the gel coat and allow to cure. The timing of the application of the PVA is important. The gel coat needs to crosslink with itself right from the start without interference from the atmosphere. Applying the PVA right after you spray the gel coat will also trap styrene in the gel coat and prevent it from evaporating, thus aiding the curing process.
Your first coat will simply consist of the gelcoat and the MEK-P catalyst. Once applied, you want to wait about an hour and a half, for the gelcoat to set. If you roll or brush your seconding coating, be sure to go the opposite direction from the previous coat, allowing a uniform coating.
If you are using our standard Exterior gelcoat, you will be ready to sand and buff your freshly gelcoated surface. To start sanding, begin with grit sandpaper and sand the surface completely. From then on, start going up to , then , and finally grit sandpaper. At this point, you can use an grit compound to compound the gelcoat. The car polishers will not work, as they spin too slowly, so you want to check the spin speed.
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. I am an architect designing and building geodesic moduled vehicles, but a novice with fiberglassing, so I am gonna need help. Good day! So, gelcoat is used as a sealing, asthetic coat. If you look at a pool, or even a boat, the gelcoat is the color you see.
We have two types of gelcoat; the brushable and the standard. You can get gelcoat with wax or without in certain cases. The wax, or Sanding Aid is an additive that allows the gelcoat to dry tack-free. With gelcoat, we recommend at least 2 coats. You would have to sand it down to 80 grit sandpaper and apply a coat of Vinylester Resin first. At that point, you can apply the gelcoat to that to get a nice finish. 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..
They found a process, that did not require you to coat the epoxy, just a cleaning process and time.. I did my test gelcoat last evening.. Sanded down with 80, and finish with before blowing off dust and acetone. I out mekp at just between 1. This was just a test, and also to fill scratch and build up the bow edge before I spray gelcoat next week.
First time working with gelcoat. The gelcoat with no wax, brushable, added pigment, let sit for 18 hours.. I tried to just take the first layer off then switch to clean pad, still even middle is gunk.. I have a couple of questions to ask to better help you.
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