Stained gel coat...going nuts here - Page 2 - SailNet Community
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post #11 of 20 Old 03-22-2007
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Muriatic acid. Dilute it 1:1 with water. Spray it on with a garden sprayer standing upwind. It will probably discolor the bottom paint. Let it sit then rinse well with water. You will have to wax the area. The acid removes everything on the hull surface.
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post #12 of 20 Old 03-22-2007
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Wink

The 3M pads don't seem to do any harm (the green kitchen jobbies) although my boat is 34 years old, so how would I know?
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post #13 of 20 Old 03-22-2007
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The 3M pads come in different colors and each color is a different hardness.

THINK TWICE ABOUT THE GREEN PADS. If you read the wrappers, they will tell you that they are too coarse and abrasive for some surfaces. The blue sponges with blue "scrunge" on them as safer, designed for fiberglass and non-sticks and such. And, I think the white scrunge material also. Since color codes vary between makers--read the label or call the maker.

I would think that since you have applied several types of wax and polish, you have also "sealed in" the stain material and your only real way to get it off is going to be wet sanding, perhaps with a 600-grit wet sandpaper. (600 to 1200+ grit available from any auto body supply shop.)

I'm guessing the stain has gone into the old porous gelcoat and there's no way to get it out without taking off some gelcoat. Which may mean it is time to ignore it for now, rather than get into a big project before launching.
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post #14 of 20 Old 03-22-2007 Thread Starter
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Update:

Nothing worked, even the Oxalic Acid. I guess its in there deep. Oh well, if I had more time to work on it but shes getting splashed tomorrow Thanks for all the good suggestions.

Maybe its time to chat with the wife about Awgrip...LOL, how many boat units would that be?

Cheers,
Shawn & the crew of S/V Windgeist

1982 Tartan 37 CB - Hull #358


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post #15 of 20 Old 03-22-2007
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T37Chef-

If you have to ask, she's gonna say no.

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post #16 of 20 Old 03-22-2007
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T37...8 to 10 units would be my guess! Tell her she can pick the color!
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post #17 of 20 Old 03-22-2007
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When I worked in a paint store as a teen... there was a sign that said,
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"Husbands are not allowed to pick custom colors unless they have a note signed by their wife."

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post #18 of 20 Old 03-23-2007
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800 grit? Do you want to remove it or polish it?

Come on go for it! Maybe my boat was made with more gelcoat but per Don Casey, if the rubbing compound doesn't work start with 120. Use a block and do it wet. Keeps the paper clean and reduces deeper scratches. If that doesn't work, you'll have removed enough gelcoat that you'll be able to fill it back in with gelcoat, then get some wax on that baby.

Cheers, Hugh
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post #19 of 20 Old 03-23-2007
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120 grit is pretty coarse and will eat through gelcoat pretty quickly, probably more quickly than anyone would want. I'd go with something a bit finer, like 220 or 400. 800 is great for touching up, but a bit on the slow side for any real work.

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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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post #20 of 20 Old 04-27-2007
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I purchased tidy bowl 2 day & my hull is certainly all "ti-deed" up! It worked 4 me!
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