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The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Rita & I have been prepping our San Juan 21 for sale, sprucing it up for prospective buyers. There was a very definite stain around the water line that I wanted to make go away. I'd already pressure washed the hull which got some of it off, then a green scrubby and some cleanser got the next layer off, but there was still a very discernable stain, especially at the stern of the boat. My manager friend at West Marine recommended I try FSR (Fiberglass Stain Remover) to clean it up. I gave it a try, expecting the usual so-so results you get from so-called miracle products. To my astonishment, the FSR not only cleaned up the existing stains, but has actually made my water line whiter than the hull in places, so now I have sort of a reverse stain going on. I guess now I've made a clean spot and will have to use the FSR on more of the boat to blend it back in to the hull background. You can also quite clearly see where I missed spots while painting it on (the sun was setting, not so easy to see what I was doing). I'm looking forward to finishing the prep work tomorrow, taking pictures and getting her up for sale.
David C-250 Mainsheet Editor
Sirius Lepak 1997 C-250 WK TR #271 --Seattle area Port Captain --
We used the WM Fiberglass Hull Cleaner(FHC?) We were astonished at how easily it removed the yellow film on the hull near and below the waterline. It was most obvious on the rudder. The yellow stains literally ran away as the FSR dribbled down the rudder.
NOTE! Do not allow FHC to touch your trailer, it'll look like pelican poop. We constantly sprayed water on the trailer near where we worked while using the chemical. But an awesome job.
In Northeast Florida we use a product called "The Works". You put some on a sponge then wipe the yellow stain off then rinse, no scrubbing no abrasive. The best thing about it is you get it at the Dollar Store for, you guest it, a dollar.
I'm willing to bet that the active ingredient in FSR and WM Fiberglass Hull Cleaner is hydrochloric acid, or as I like to call it...toilet bowl cleaner!
Don, It's actually equal parts oxalic acid and isopropanol (alcohol), but it'd probably work just fine cleaning a toilet, or removing black stains from oak.
I'm not sure I would use an acid to clean wood without first trying a sample. I have used chlorine bleach to remove the black water stains from oak or fir. But the bleach did not seem to touch the tanic stain around the waterline. Sno-Bowl did a good job on that.
Ben, Oxalic acid is the standard treatment for metallic stains on oak, it bleaches out the stain without bleaching the wood itself. How well did using chlorine work for the stains? Does it bleach the wood as well (I've never tried it on wood).
Years ago there was a gentleman in the Municpal Yacht Harbor in New ORleans who had inherited a boat which he could not otherwise have afforded. I don't remember the brand, but it was a little 23 or 25 footer. It was by far one of the neatest, cleanest and well maintained boasts in the harbor. I asked him once what he cleaned his teak with and he responded "clorox, use it for everything." I've never tried it, but. . .
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.