My father's 2009 38 fountain express has some gelcoat issues. It is very porous on the deck. It gets stained from everything. Spider droppings leave spots. I tried toilet bowl cleaner and it turned the area blue. I've tried spider wax and it will stain it pink. I've tried spider spray and it stains it yellow. Anything you put on it it absorbs the color. I've tried wet sanding with 1200 and polishing back out. Then waxing, and the spots from the spiders still won't come out. It also won't keep more from staining. I am a body man and do tons of fiberglass and gelcoat work, but this one has me stumped. Short of sanding painting and clearing, anyone have any ideas to get the spots out and seal this thing up.

Try some Gel Gloss http://gel-gloss.com/index.php?pageId=584
Spray it on the stain and let it sit for about 30 seconds and then wipe off.

I would try magic eraser and a good cleaner or magic eraser with acetone or acetone by itself

Surely there has to be a couple of wax cleaner / compounds combos that would take it off to.

It's crazy. Never seen anything like it. I sanded with 800 then 1200 and couldn't get far enough to get them out.

Crazy as it will sound, SUNLIGHT!

Have kept my boats in a boathouse for over a decade now and spiders are just a part of it, with the spiders comes the spider chit. Most stains that will not wash or wax out will fade out and away in the sun, good old bright sunlight will make the stain vanish. I know it sounds stupid but I have gone out for the day, more than once, with the little pinkish chit stains on the hatch skin or the deck and at the end of the day they are just F'n gone. Can't explain it, just happens.