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Water level stain on hull

Is the stain on the gel coat of a hull made of fiberglass? If so, I've been pleased with the results of using Davis "Fiberglass Stain Remover". It comes in plastic jar labelled "FSR". The product is a gel that I apply with a rag (wearing rubber gloves). It takes a little scrubbing with the rag and leaving it on for a few minutes, but when you come back with a clean dampened rag, the stains come right off.

https://www.davisinstruments.com/product/fsr/
 
DJR said:
Is the stain on the gel coat of a hull made of fiberglass? If so, I've been pleased with the results of using Davis "Fiberglass Stain Remover". It comes in plastic jar labelled "FSR". The product is a gel that I apply with a rag (wearing rubber gloves). It takes a little scrubbing with the rag and leaving it on for a few minutes, but when you come back with a clean dampened rag, the stains come right off.

https://www.davisinstruments.com/product/fsr/
Click to expand...

It's a older boat dont think it has any gel coat just fiberglass
 
Rusty rudder said:
It's a older boat dont think it has any gel coat just fiberglass
Click to expand...
If the hull doesn't look like fiberglass strands or matting in resin, it has some kind of gelcoat or paint on it. Bare fiberglass/resin doesn't last long on a hull that's in water for long periods. Post a photo.

I have used white ScotchBrite pads and dish soap- the staining is organic, so you shouldn't need strong chemicals to remove it. Once it's gone, you can polish and wax the hull.
 
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