Yes, use transparent epoxy to hide it. Sand the ply first, then use a scraper to scrape the epoxy on so there are no runs. Use just raw epoxy with no fillers. After that, a little sanding and many applications of varnish. You can also buy finished panels from vendors who specialize in fiberglass products.
Epoxy should not be put over other coatings as a general rule. Water-based stain is an exception (if it has been fully dried), but anything containing solvents may cause harm to the epoxy layer, or the epoxy may weaken the varnish/stain. If possible, use two coats of different colors of paint.
However, if you must use one product on top of another, make sure that they are from completely different classes of materials. For example, you could use latex paint on wood that has already been coated with acrylic house paint, but if you want both coats to stay for awhile then you'll have to get rid of the old stuff first so there's no danger of it breaking down its companion coating.
If you're just looking to add some color to an existing project, then go for it! There are lots of bright paints out there that would look great on varnished wood. Just make sure that you don't have any other shops working on your project at the same time because they will need separate coats too.
Sand the epoxy with 120-grit paper while it is still wet. The 120-grit-150-grit sandpaper has an excellent tooth for varnish adherence, and varnish coats quickly cover scratches. Finer grits should be used with thinner finish coats. Apply two or three coats of varnish, as directed by the manufacturer. Replace the trim. Make certain that all fastener holes are epoxy-sealed.
The best way to use epoxy over lacquer is similar to using varnish over lacquer. Three coats of polyurethane are recommended for maximum protection. Epoxy can also be applied directly to wood surfaces, but it's not recommended for pine trees because they contain oils that will cause the epoxy to crack.
The best way to use epoxy over oil-based paint is similar to using varnish over oil-based paint. Three coats of polyurethane are required for maximum protection.
The best way to use epoxy over latex paint is different from using varnish over latex paint. Latex paints contain resin chemicals that can remove some of the topcoat if it gets wetted down. This allows the wood to show through.
Paint or varnish will not adhere to epoxy. Epoxy becomes really hot and cures far too rapidly. The formation of bubbles in the epoxy coating on porous material (bare wood or foam) indicates that there is no air entrapment and thus no danger of bubbling.
However, you can mix paints if you want. There are two ways to do this: dry blending and wet mixing. In both cases, use a paint mixer such as those made by Kenyon or Nordika for blending colors into white or dark shades. These devices work by agitating the paint ingredients with steel balls or beads at low speeds. The results are blended colors without cloudiness or streaks.
Dry blending is done when you need only one color. For example, if you are covering a wooden table with veneer and want it to match another table already painted, then use a color from that table to blend with the epoxy. You can also use different colors for trim vs. body. For example, if your table is going inside and gets scratched easily, use a soft color for the trim while a harder one works better for the body.
Wet mixing uses different types of liquids that become solidified when mixed together.
It's as simple to restore a discolored surface on fiberglass. Many professionals advocate applying a marine varnish for a glossy, long-lasting finish that can tolerate harsh sunshine, water, and temperature variations. If the stain is still in good condition, add a few coats of varnish with a thin roller. Let each coat dry completely before applying the next layer.
Fiberglass is a glass material used in building, architecture, and construction. It's flexible, strong, and can be molded into many shapes. The word "fiber" comes from the Latin fibrum which means "thread". Fiberglass has innumerable applications including roofing materials, insulation, fencing, and sporting goods. It is also used in vehicles (such as cars, trucks, and boats) for components such as dashboards, floor boards, and other internal parts.
As long as you don't paint over top of a previously applied product or apply multiple layers of products that contain UV inhibitors, your fiberglass boat will remain stain resistant. That being said, it is always recommended to avoid using natural products on fiberglass because they may require additional treatments under sunlight to prevent fading.
If you do choose to use a natural product, make sure that it does not contain any UV inhibitors. These chemicals are added to protect the wood from fading when exposed to sunlight.
Stain removal from fiberglass requires only soap and water if you have properly prepared wood.