Interprotect Barrier Coat Questions - Page 2 - SailNet Community
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post #11 of 13 Old 04-29-2011
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Originally Posted by cghubbell View Post
According to the Interprotect Product sheet when overcoating with VC-17m the Interprotect layers are supposed to dry for 24-36 hours, then be sanded with 180-220 grit paper.

So, it looks like the thumb prints are more for timing the Interprotect layers than tying in with my anti-fowling. This process only applies to the VC-17m or VC-17m Extra though. All other anti-fowling paints must be applied in the overcoating window.

Lotsa details to manage with these boat projects!
Sorry, my bad, I missed that part about the VC. VC does not chemically bond with a barrier coat like many bottom paints do..

The Interprotect layers do not need thumb print timing and can be re-coated once dry. If you try it with thumb print it can lift and soften the lower layers. Ask me how I know.... Doh'.... The open times are quite long before needing to sand IP2KE for another coat.

-Maine Sail / CS-36T

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post #12 of 13 Old 04-30-2011 Thread Starter
Beneteau F310 ~ APOTHIC
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Just wanted to check in and thank everyone for the moral support leading up to the project. I got two coats applied today, and she looks like a new boat. It's nothing short of amazing.

I ended up using a solvent resistant mohair brush in a nap slightly finer than what Interlux called for. Why? Because it's what the chandlery had in stock and I didn't want to blow time driving elsewhere. The finish is certainly not gelcoat-smooth, but it's very, very nice compared to what I started with. I have no complaints.

It was a little tricky figuring out how thick to roll it on. I get the impression that Interlux wants it rolled on fairly heavy based on the number of coats they recommend and how far each batch went. Takes quite a bit of concentration to avoid sags at that level, but it is very do-able. My second coat was a day and night difference from the first. A nice quality of IP2k is that its thickness hides goofs very efficiently on subsequent coats.

There were ZERO issues with quick curing. I mixed up 50% of the product per batch and let it sit for the recommended 15-20 minutes to evacutate air bubbles. I'd occasionally see a little skim on the surface of the bucket's contents, but 10-15 seconds of swizzling dissolved that back into the soup.

One gallon of IP2k covered about 1-1/3 of my hull, so I think I'm going to end up over Interlux's recommended thickness. No harm done there.

Here she is at coat #2 where I left her this evening...

From Restoring Ravat

From Restoring Ravat

From Restoring Ravat

Tomorrow morning it's back out to the yard to finish up coats 3 & 4. If I'm lucky I may even get the new bow hatch installed while coat 3 dries. Whew!

Beneteau F310 ~ Apothic
PYC, Lake Ontario
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post #13 of 13 Old 04-30-2011
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Last year I helped a friend do the coat on his Erricson 27. the old gel coat was all spider cracked I mean the whole bottom too.. He completely stripped all the old paint, and did like 6 thick coats of 2000E. Not a single crack has telegraphed through the barrier coat a year later. So it's not only a barrier coat it's also a new skin.

"Next best thing to not having a boat? The knowledge from having one!" Denise, Bristol PA, On Tidal Delaware River, Anchor Yacht Club.
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My last project!
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