In fact, you can watch our video on How to Restore Faded Gel Coat on a Boat if that's a problem with yours. But sometimes, you face really tough stains. But sometimes, you face really tough stains. Regular spray-on cleaner may get up most of the dirt, but uh-oh, I think I just found one of those stains. 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. Feb 16,  · A gel acid-based stain remover will work best to remove stubborn stains. Wear rubber gloves and eye protection before you apply the remover. Use a rag to swab the cleaner across the stain and then let it sit for 20 minutes. Use a hose to rinse off the remover%(25).
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. Feb 16,  · A gel acid-based stain remover will work best to remove stubborn stains. Wear rubber gloves and eye protection before you apply the remover. Use a rag to swab the cleaner across the stain and then let it sit for 20 minutes. Use a hose to rinse off the remover%(25). Tannin staining of your hull can be frustrating but luckily it is easy to remove, if you use the right chemicals or product. Any job goes smoother when the right product is chosen over the wrong product. Sadly over the years I have watched number of boat owners destroy gelcoat or paint by using sandpaper or abrasives to try and remove Boat Gel Coat Stain Removal Venture tannin.

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