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more paint q's: barrier/primer

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kbq
1st Mate

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USA
99 Posts

Initially Posted - 05/23/2007 : 17:02:32

Folks -

The Admiral has decreed that I shall spend this weekend (plus a couple vacation days) at a local yard painting. She doesn't want to worry 'bout keeping all the neighborhood kids away from the toxics.

Fine. Didn't have anything better to do anyway...

I'm going to be using Interlux Micron CSC, a good paint for hulls that spend time dry. The yard suggests using Interlux 2000E as a barrier coat (with two overcoats of CSC).

Now, Interlux 2000E takes 3 hrs to two weeks (!) to overcoat. So... first question: what's the real, practical time to overcoat?

Second question: is a primer/barrier even needed? This is a bare bottom ('cept for some wax and bay growth remains), 2004 hull.

Third: If, in fact, I should use a barrier, and if, in fact, 2000E takes a long time to dry to overcoat, what's a good alternative?

Thanks, guys - and I'll take pix.

Kevin
wait for me
250wk

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stampeder
Master Marine Consultant

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1608 Posts

Response Posted - 05/23/2007 : 20:42:01

I did a bottom job last spring using Interlux products. I rolled on two coats of Micron CSC hard bottom Paint over Interlux No Sand Primer YPA200.
My Marina, and Interlux directly suggested these products, as my boat is out of the water about 4 months of the year.
First thing I did to my 1981 SR/SK was remove 25 years of PO bottom jobs, then primed the bare bottom with the YPA200, then painted over the YPA200 while it was still 'thumb print' tacky. The sanding took me about 8 hours, and the painting took about 3 hours.
I did a lot of research before I started this big job - I asked lots of questions here as well as phoning Interlux on their 800# and I drove my local marina crazy by asking them their first hand experiences.
final result: one year later, my bottom looks great.Boat has been in the water about 8 months, and off and on the trailer twice. Interlux told me that geographic location is very important - so I'd suggest phoning interlux directly, and telling them where you are, and your sailing conditions.
I'm definitely not an expert, but it sounds odd to me that you would have to leave a barrier coat to dry that long. Call Interlux.

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Steve Milby
Past Commodore

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USA
5902 Posts

Response Posted - 05/24/2007 : 08:12:04

To answer your question, I'm just finishing the job of barrier coating my boat, a C&C 35, and I also did it to my C25. I have applied 2 coats per day of Interlux 2000E, but could apply 3 per day on my C25, when I was younger and could tolerate the muscle aches. I start each successive coat about 4 1/2 to 5 hours after I started the previous coat. I applied 1 coat on Tuesday, 2 coats yesterday, and will apply the last 2 coats today. This weekend I'll be crewing for a friend in a race, and it's supposed to rain Monday, so I won't apply the 2 coats of antifouling until next Tuesday. Before applying the antifouling, I'll sand it lightly, just to knock off the little insects that got stuck in the paint, and to smooth the little nubs. I plan to launch, finally, next Wednesday.

But, Catalina has barrier coated the underwater surfaces of boats built after about 1989, and I've been told they warrant the bottom against blisters for 5 years, as long as the factory-applied barrier coat isn't disturbed. Your 2004 boat should still be under warranty. Unless your bottom has been sanded or stripped, it shouldn't need a barrier coat. Just apply antifouling.

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kbq
1st Mate

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USA
99 Posts

Response Posted - 05/24/2007 : 11:26:55

Thanks, Stampeder and Steve!

Just got off the phone with Interlux. Easy people to deal with...

The rep said to prep the bottom with Fiberglass Surface Prep and a maroon Scotch-Brite pad. Follow this with one coat of 2000e. When that's ready for overcoat, proceed with the Micron CSC.

Hey - piece of cake, right? 8D

I'll let you know how it goes.

Kevin
wait for me
250wk

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