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On 3 May 2006 12:51:09 -0700, wrote:

I have a nice rust stain in my gelcoat, in the cockpit as a result of
leaving a pair of pliers out in the rain for a week. What would be the
best way to remove the stain without damaging the gelcoat?

You've already been steered to products containing oxalic acid. There
are some "marine" stain cleaners which are pretty much just diluted
and marked up oxalic acid. If you want the pure stuff, it's
available here in the US in stores like Home Depot and Lowe's. It's
usually found in the paint section for next to nothing. Right next to
it you'll see tri-sodium phosphate (TSP) which is another ingredient
found in highly marked up "marine" cleaners. Neither is particularly
dangerous, but do read the warning labels, please.
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