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Old 06-12-2011, 19:51   #1
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Barrier Coat Above Jack Stands

So I had my bottom sodablasted to remove multiple layers of antifouling paint. Under the antifouling was a layer of barrier coat that apparently did a pretty good job of keeping the dreaded blisters away. Except that there are four patches, where the jackstands were located, that did not get barrier coat and got blistered .

So I'm going to repair the blisters and cover the bottom with Interprotect 2000 or 3000 (haven't decided which), but how do I ensure that the entire bottom gets covered? International Paint recommends that each new coat of paint be applied while the last coat is still tacky (4-5 coats are recommended plus antifouling). If I just move the pads to a new location, I'm affraid they will get stuck to the bottom . I suppose I could try covering them with a sheet of release fabric? Someone else must have figured this out.

Any suggestions?
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Old 06-12-2011, 19:57   #2
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Re: Barrier coat above jack stands

Just had my bottom done and the way he did it was do the process, 5 coats of barrier coat and bottom paint EXCEPT under the jack stand pads. Then when the rest of the boat was cured and dry he moved the stands over a couple of feet and did the whole coating and curing process over again on the exposed squares.
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Old 06-12-2011, 20:00   #3
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Re: Barrier coat above jack stands

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Just had my bottom done and the way he did it was do the process, 5 coats of barrier coat and bottom paint EXCEPT under the jack stand pads. Then when the rest of the boat was cured and dry he moved the stands over a couple of feet and did the whole coating and curing process over again on the exposed squares.
Wow. I hope you tipped the guy for great service.
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Old 06-12-2011, 20:00   #4
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I did the 5 coats, let them harden, then moved the jack stands and did those spots. Just sand a little and let it overlap a bit.
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Old 06-12-2011, 20:12   #5
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Re: Barrier coat above jack stands

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Wow. I hope you tipped the guy for great service.
He finishes up tomorrow. Unless he screws up the last coat of bottom paint it looks like he did a pretty good job.

Plus he did it at my place out in the woods so guess I better treat him right.
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Old 06-12-2011, 20:33   #6
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Re: Barrier coat above jack stands

That is also the way mine was done two years ago. Five coats of Interprotect, two coats of bottom paint, then the pads were moved, the pad spots were done with the same five coats of interprotect, two coats of bottom paint then the whole exposed bottom given two more coats of bottom paint. Pads moved again and the last pad spots two more coats of bottom paint. 24 hours drying time and splashed. But it was expensive.
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Old 06-12-2011, 20:47   #7
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Re: Barrier coat above jack stands

Patchwork where paints hadn't previously been applied under jack stands.

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Old 06-12-2011, 20:52   #8
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Re: Barrier coat above jack stands

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Patchwork where paints hadn't previously been applied under jack stands.

yeah, add a fin keel and that's how mine looks. Two years of monthly bottom cleaning and the diver can still see where the jack stands were.
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Old 07-12-2011, 10:50   #9
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Re: Barrier coat above jack stands

We want to put a primer on top of a base gell coat layer, then antifouling; we've heard of chlorinated rubber based primer but are having trouble finding it here in Curacao, what other primers are there please?
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Old 07-12-2011, 20:46   #10
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Re: Barrier coat above jack stands

Just a heads-up, most boatyards I know go ballistic if anybody but their staff moves a jackstand.
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Old 07-12-2011, 20:54   #11
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Re: Barrier coat above jack stands

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Just a heads-up, most boatyards I know go ballistic if anybody but their staff moves a jackstand.
Wouldn't think of it. Costs me $300 to have them move supports to paint areas covered by supporting members.

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Old 08-12-2011, 04:32   #12
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Quote:
Originally Posted by markpierce

Wouldn't think of it. Costs me $300 to have them move supports to paint areas covered by supporting members.
That's probably true, but I've lived in a couple of small yards while refitting the boat, and moved mine several tines. I did check with the yard crew, and in one case, a guy came over to check them and made an adjustment, but other than that, they were fine with it.

But let me say that I do all my own work and after a while they became comfortable with me doing things they might allow others to do. That included raising the boat with additional stands in order to move the blocks under the keel.
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Old 08-12-2011, 05:35   #13
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Re: Barrier coat above jack stands

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Wouldn't think of it. Costs me $300 to have them move supports to paint areas covered by supporting members.

Do they often block-up with long dimension vertical, and no (apparent) cleats on the blocks. Never in the yard I use, and I am allowed to move the 4 stands per side, and 2 stem stands.
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Old 08-12-2011, 05:40   #14
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Re: Barrier coat above jack stands

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Except that there are four patches, where the jackstands were located, that did not get barrier coat and got blistered
A nice testimonial to your barrier coat. Maybe they can use that in an advertisement?
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Old 08-12-2011, 09:37   #15
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Re: Barrier coat above jack stands

When you finish your bottom paint before remembering that you have to move the stands to paint there... and you borrow some paint from Jedi (with her black bottom) to paint these spots, this is how the end result looks:


(Bill is gonna kill me when he finds this picture here :-) )

A couple of weeks later we were ready to splash... count how many stands we have and thus how many spots to paint after moving them...



cheers,
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