Sep 05,  · Apply a fiberglass stain remover, like 3M Fiberglass Restorer and Wax, Mothers Marine Black Streak Remover, or 3M Marine Cleaner and Wax to the stained gelcoat area with a clean rag. The black/gray stains are the result of soot being deposited on your hull. Oct 05,  · Clean the gelcoat surface with a cloth and fiberglass cleaner. Spray or apply the fiberglass cleaner onto the gelcoat surface. Use a clean cloth or towel to wipe the surface and remove dust, dirt, and grime. Spend some time scrubbing off any Views: Rub the gel stain vigorously until it begins to come off. Pour more thinner onto your rag if needed and continue to scrub until the stain is dissolved. Dispose of rags contaminated with lacquer thinner according to local laws.
Rub the gel stain vigorously until it begins to come off. Pour more thinner onto your rag if needed and continue to scrub until the stain is dissolved. Dispose of rags contaminated with lacquer thinner according to local laws. Sep 05,  · Apply a fiberglass stain remover, like 3M Fiberglass Restorer and Wax, Mothers Marine Black Streak Remover, or 3M Marine Cleaner and Wax to the stained gelcoat area with a clean rag. The black/gray stains are the result of soot being deposited on your hull. Apr 27,  · As a safer alternative, try cleaning water stains with a paste made of white vinegar and baking soda. Let the mixture sit on the stain for an hour before gently scrubbing the surface and rinsing it with clean water. Add a drop of liquid soap or hydrogen peroxide for extra cleaning power. %(21).

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