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Go Back   SailNet Community > On Board > Gear & Maintenance > Bottom paint prep, chipped paint
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Thread: Bottom paint prep, chipped paint Reply to Thread
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Topic Review (Newest First)
02-14-2010 09:24 PM
josrulz
Quote:
Originally Posted by chef2sail View Post
I have also used the sand man with great results. Took off alll the old paints with no damage to the barrier coat at all. Jos just curious...our bottom paint lasts two years and we are in similar areas. Do you do any maitainence on it during the year such as use a diver or dive and maintain it yourself. Can you touch up you chipped area and get another year out of your paint instead of just adding a few new layers to it?

Dave
Hi Chef, we had a diver under the boat about mid-way through the year, and when we hauled the boat, the bottom was actually pretty clean. I probably should have made the yard just wash lightly, because there wasn't much need to hit it hard.

I would think that if we sanded and touched up the keel and strut (which would mean another coat on them probably), and then just sanded and touched up where the chips are on the hull (not many), then we'd be good to go. The paint appeared to be in good shape before the wash.

I'm just surprised the power wash took off so many chips. Pounding into the chop on the Chesapeake didn't cause it, so it's not like the paint was just "loose".

It would be nice to get another season out of it, then I can sand off more or even soda blast it next year when it'll need more fresh paint anyway.

Just out of curiousity, since the chips are more on the keel and the strut, could the paint flaking there be a galvanic thing? Or am I thinking too hard?
-J
02-14-2010 09:21 PM
CLucas Good thread, especially since I'm also facing this project in the spring... Haven't priced out soda blasting but suspect it may be beyond my budget. Thoughts on sanding alone vs starting with a chemical stripper (e.g. Interstrip or Peelaway)? I have Micron Extra (abalative) on my bottom but have some areas where the paint hasn't adhered well and is flaking.
02-14-2010 09:14 PM
chef2sail I have also used the sand man with great results. Took off alll the old paints with no damage to the barrier coat at all. Jos just curious...our bottom paint lasts two years and we are in similar areas. Do you do any maitainence on it during the year such as use a diver or dive and maintain it yourself. Can you touch up you chipped area and get another year out of your paint instead of just adding a few new layers to it?

Dave
02-14-2010 07:13 PM
sailingdog No, not if it is done right.
Quote:
Originally Posted by josrulz View Post
Would soda blasting take off the barrier coat too? And does he do soda blasting on location, as in outside of Pasadena? Not sure we really want to go that far at this stage, but it would be good to know.
Thanks!
-J
02-14-2010 06:59 PM
josrulz
Quote:
Originally Posted by T37Chef View Post
Jos,

BTW, there is a good soda blaster guy in the Pasadena area, your yard probably knows him, "The Sand Man". I think I paid $580 +- to have my 37' boat blasted.
Would soda blasting take off the barrier coat too? And does he do soda blasting on location, as in outside of Pasadena? Not sure we really want to go that far at this stage, but it would be good to know.
Thanks!
-J
02-14-2010 06:34 PM
T37Chef Jos,

BTW, there is a good soda blaster guy in the Pasadena area, your yard probably knows him, "The Sand Man". I think I paid $580 +- to have my 37' boat blasted.
02-14-2010 05:56 PM
nickmerc You will probably be OK just sanding with 60 or 80 grit down to the barrier coat. Most likely the barrier coat will be a different color than the bottom paint. Just be sure to sand down to the barrier coat, not through it. If you do, you can patch it. Depending on how old it is you may want to sand down to the gelcoat too and start over.

My old bottom paint was not bonded well so I was able to use a scraper to remove it down to the barrier coat on 80% of the surface.
02-14-2010 12:08 PM
josrulz
Quote:
Originally Posted by T37Chef View Post
Hey, at least its not blisters
Ha ha! That's true! Just looks like paint to me. Didn't see any bubbles anywhere even right when she came out of the water.

I edited my last post, so not sure if you'll see it...for future reference, is there a safe way to strip the bottom paint without damaging the barrier coat (when the time comes)?
02-14-2010 12:05 PM
T37Chef Hey, at least its not blisters
02-14-2010 11:57 AM
josrulz
Quote:
Originally Posted by T37Chef View Post
It sounds like there was not a good bond between paints, hence the power-washer chipping it away.

Some ablatives are not compatible with each other. Unfortunately, you'll probably want to take it down to the barrier coat, if not the gel coat or fiberglass someday. But for now just repairing the chips will do.
Well, it's possible the prep wasn't very good. You never know with the yard, though it was a yard with a good reputation. The paints are both Petit, and are listed on their site as being compatible. But of course prep is just as important.

EDIT:
Quote:
Originally Posted by T37Chef View Post
...Unfortunately, you'll probably want to take it down to the barrier coat, if not the gel coat or fiberglass someday. But for now just repairing the chips will do.
By the way, I meant to add to this post that I'm not against eventually stripping. But we have a very long maintenance list this year, since the boat is basically new to us, so if we can sand and paint this year without causing any harm, then it's the way to go. Less than ideal would be OK with me, so long as the bottom doesn't foul and we're noting causing more problems. There are other things on our list that are more immediate, and need to be done this year.

Out of curiousity, is there a way to strip safely while leaving the barrier coat in tact? I assume so, but just asking for future reference.
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