West system Says ... But what about the primer ?

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krissteyn
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West system Says ... But what about the primer ?

Post by krissteyn »

Wonder what the pundits will say ?
I am busy with the prep of my osmotic blisters and am going to use West System to repair the "patches" (some are large). If I read up on all West Systems Reccomendations - I dont need a primer before using my standard Ablative Antifoul paint.
BUT
The locals in the marina assure me a primer must be used.

I was going to sand/wash/thoroughly prep the cured surface before the final 2 coats of antifoul - now I am wondering ???

Kris
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Tim
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Post by Tim »

When doing a large bottom job of the sort required to repair widespread blistering, you should seal the entire bottom with unthickened epoxy. Another alternative is to apply a manufactured epoxy barrier coat, which is applicable here since you're doing a major bottom job. Sealing the faired patches with plain resin helps increase the watertight integrity of the patches. Once the bottom is coated with several coats in this manner, wash with a Scotch Brite pad and water, lightly sand, and paint.

I'm not aware of any primers for bottom paint, and bottom paints don't require primers. Why not ask the locals what specific primer product they're talking about, and see what they say. I'm guessing they don't really have an answer.
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Post by catamount »

Tim wrote:Why not ask the locals what specific primer product they're talking about, and see what they say. I'm guessing they don't really have an answer.
Or maybe they'll say "epoxy barrier coat"


(which is different from WEST how?)
Tim Allen -- 1980 Peterson 34 GREYHAWK
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Hirilondë
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Post by Hirilondë »

The only advantage I can see to a 2-part epoxy barrier coat over straight 2-part epoxy resins is a longer and easier 'hot' recoat schedule. And also that bottom paint can be 'hot' coated over the barrier coat if within 9 hours (at least this is true for Interprotect 2000).

I doubt you will get a truly factual reply as to why and what primer you need either.
Dave Finnegan
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Post by CharlieJ »

we rolled on three hot coats of epoxy, using West Sys and their additive for barrier coating. 422 I think it is. Let that cure, sanded lightly and rolled on the bottom paint. It's been almost two years now and it's still holding fine.

Used Pettit ACP 60 , no primer.
krissteyn
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Post by krissteyn »

Well thanks for the input - well received...

I ended up using the same product my neighbour was using for a blister peel/restore job - the interlux 2000e barrier coat. What I liked was the ability to use it to seal and with additives use to fair the holes. I ended up with a fairly smooth bottom and covered it with 2 coats bottom paint .

The ability to thicken and paste on the 2000e made the job much easier and the ability to place the next coat over the previous without sanding was a blessing. 3 gallons of 2000e and the job was done !

thanx

kris

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