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Wet sanding an older boat

Posted on 4/20/20 at 6:48 pm
Posted by CM Tiger83
Lafayette, LA
Member since Sep 2011
738 posts
Posted on 4/20/20 at 6:48 pm
Anyone have any advice on wet sanding an older fiberglass boat? It is a 20 year old 24’ fish master that my dad offered to give me.

It is oxidized pretty bad. Thinking about wet sanding with 1000 grit and 2000 grit, then compound waxing and polishing. Never done it before and wasn’t sure if anyone had tips or things to watch out for.
Posted by Redlos
Baton Rouge
Member since Jul 2005
1046 posts
Posted on 4/20/20 at 10:06 pm to
YouTube is your friend, get a nice DA orbital
Posted by MrCoachKlein
Member since Sep 2010
10302 posts
Posted on 4/21/20 at 4:42 am to




Posted by Chris4x4gill2
North Alabama
Member since Nov 2008
3092 posts
Posted on 4/21/20 at 6:07 am to
Here is a good thread I referenced a lot when I did my old boat several years ago.

Wetsanding
Posted by Dock Holiday
Member since Sep 2015
1637 posts
Posted on 4/21/20 at 7:20 am to
I did a 22 footer a few years back, it's not that hard, just time consuming.

Remove anything you can that is bolted on, cleats, grab bar, etc. Consider new sticker replacement, but do not remove the old until you have the replacement. The old stickers will have a "shadow" behind them that is really hard remove. Remove old stickers with heat gun, plastic spatula, and some goo gone.

I avoided the orbital sander and went with hand sanding. I hit with 1000 first, but was not aggressive, then hit with 2000 for a longer period.

Sanding was the easy part, compounding took the most work. I got all my supplies from a local PPG store the auto body shops use. Used 3M compounding liquid and pads and well as polishing liquid and pads. Compounding and polishing have separate pads.
Obviously you need a good variable speed polisher, but be careful staying in one spot too long on high RPM's, you will make a burn spot in the gelcoat.

It's a 5 step process so keep beer handy.

1 - 1000 grit sand
2 - 2000 grit sand
3 - compounding
4 - polishing
5 - wax (twice)
Posted by down time
space
Member since Oct 2013
1914 posts
Posted on 4/21/20 at 11:19 am to
Presta gel coat compound and matching cutting pad. Then a good dewalt rotary polisher. The dual actions dont cut well, they work for light polishing.
Posted by CM Tiger83
Lafayette, LA
Member since Sep 2011
738 posts
Posted on 4/27/20 at 2:28 pm to
Wet sanding, compounding, polishing and wax is done and the boat came out great. Much better than I had expected.

Next project is to repaint the engine. I haven’t started researching How to do it yet but if anyone has done this already and has any advise it would be greatly appropriated. Been trying to look up a paint code for Johnson 200 HP year 2000 to get Sherman williams to match but can’t find it anywhere.
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