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06-12-2011, 18:51
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#1
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Registered User
Join Date: Apr 2008
Location: U.S., Northeast
Boat: Currently boatless
Posts: 1,643
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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?
__________________
... He knows the chart is not the sea.
-- Philip Booth, Chart 1203
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06-12-2011, 18:57
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#2
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Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
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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.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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06-12-2011, 19:00
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#3
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CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
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Re: Barrier coat above jack stands
Quote:
Originally Posted by skipmac
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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Wow. I hope you tipped the guy for great service.
__________________
cruising is entirely about showing up--in boat shoes.
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06-12-2011, 19:00
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#4
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Registered User
Join Date: Dec 2010
Location: Liveaboard
Boat: Allied Luders 33, Hull 98, 1971
Posts: 393
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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.
__________________
don
NV5L
S/V Aurora
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06-12-2011, 19:12
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#5
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Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
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Re: Barrier coat above jack stands
Quote:
Originally Posted by Bash
Wow. I hope you tipped the guy for great service.
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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.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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06-12-2011, 19:33
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#6
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Registered User
Join Date: Mar 2007
Location: Cormorant Island, BC, Canada
Boat: Lancer 44 Motorsailer
Posts: 1,877
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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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06-12-2011, 19:47
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#7
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Registered User
Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,782
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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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06-12-2011, 19:52
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#8
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CF Adviser
Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
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Re: Barrier coat above jack stands
Quote:
Originally Posted by markpierce
Patchwork where paints hadn't previously been applied under jack stands.
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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.
__________________
cruising is entirely about showing up--in boat shoes.
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07-12-2011, 09:50
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#9
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Registered User
Join Date: Nov 2010
Location: onboard; Guanaja, Bay Islands Honduras
Boat: 1969 Bristol 33'
Posts: 17
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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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07-12-2011, 19:46
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#10
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Registered User
Join Date: Aug 2009
Location: Bahamas/Florida
Boat: Solaris Sunstar 36' catamaran
Posts: 2,686
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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.
__________________
Sail Fast Live Slow
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07-12-2011, 19:54
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#11
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Registered User
Join Date: Aug 2010
Location: Central California
Boat: M/V Carquinez Coot
Posts: 3,782
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Re: Barrier coat above jack stands
Quote:
Originally Posted by FSMike
Just a heads-up, most boatyards I know go ballistic if anybody but their staff moves a jackstand.
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Wouldn't think of it. Costs me $300 to have them move supports to paint areas covered by supporting members.
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08-12-2011, 03:32
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#12
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Registered User
Join Date: Dec 2010
Location: Liveaboard
Boat: Allied Luders 33, Hull 98, 1971
Posts: 393
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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.
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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.
__________________
don
NV5L
S/V Aurora
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08-12-2011, 04:35
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#13
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Registered User
Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,131
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Re: Barrier coat above jack stands
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.
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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.
__________________
so many projects--so little time !!
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08-12-2011, 04:40
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#14
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Registered User
Join Date: Jun 2006
Posts: 670
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Re: Barrier coat above jack stands
Quote:
Originally Posted by Ziggy
Except that there are four patches, where the jackstands were located, that did not get barrier coat and got blistered
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A nice testimonial to your barrier coat. Maybe they can use that in an advertisement?
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08-12-2011, 08:37
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#15
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always in motion is the future
Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 18,760
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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,
Nick.
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