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Author Topic:   west system bottom barrier coat
Clam Hound posted 07-30-2002 05:31 PM ET (US)   Profile for Clam Hound   Send Email to Clam Hound  
I removed the bottom paint off my 13' '69 whaler and discovered some areas where the laminate was visible. Would it be necessary to seal it with a barrier coat or just awlgrip the bottom, or do both? The boat will be stored out of the water.
JFM posted 07-30-2002 06:54 PM ET (US)     Profile for JFM  Send Email to JFM     
Clam, I would barrier coat it. Awlgrip under the water line is not water proof. You would be better to re gel it or use bottom paint under the water line. Regards, Jay
dangc78 posted 07-30-2002 07:25 PM ET (US)     Profile for dangc78  Send Email to dangc78     
It really depends on what you plan on doing with the boat. If it is going to be used in salt water, you should apply a barrier coating/bottom paint. If it was my boat, i would apply three coats of west system epoxy lightly sanding with 150 grit paper in between coats and re-gelcoat (for fresh water setup) or bottom paint (for salt water.)
world2xplor posted 07-31-2002 01:22 AM ET (US)     Profile for world2xplor  Send Email to world2xplor     
Fresh or salt water, I would be hesitant to use Awlgrip below the waterline as the topcoat/finish paint. In as little as 2 days in the water, or simply sitting on wet carpeted trailer bunks, the Awlgrip will blister, irregardless of whether or not you used a barrier coat. Barrier coats are simply to seal the laminate so water cannot get to it, and therefore prevent osmotic blistering.
jimh posted 07-31-2002 09:58 AM ET (US)     Profile for jimh  Send Email to jimh     
Why do they paint million dollar yachts with AWLGRIP if the stuff is not water resistant? Something seems out of wack here.
JFM posted 07-31-2002 05:29 PM ET (US)     Profile for JFM  Send Email to JFM     
Jim they paint $$$$ boats with Awlgrip above the water line. However, most $$$$ boats are gel coated so thick they last forever and you just have the crew buff and wax. They bottom paint below the water line. Regards, Jay
70_Katama posted 08-01-2002 01:25 PM ET (US)     Profile for 70_Katama  Send Email to 70_Katama     
I'm in the process of Awlgriping my hull. The topside is already done with a whaler blue match. I had to strip several layers of paint (peel-away) and then sand into the gelcoat to remove the rest. I applied 3 coats of west after making several small repairs on the entire hull. With two coats of awlgrip primer and 4 coats of awlgrip paint, the bottom should should be good for years. I also have a keel guard that I'm going to install after I get the final coat on.
PS..I'm rolling and tipping with no problems.
Clam Hound posted 08-02-2002 12:35 AM ET (US)     Profile for Clam Hound  Send Email to Clam Hound     
Thanks all.
John W posted 08-02-2002 10:21 AM ET (US)     Profile for John W  Send Email to John W     
world2explor is right, polyurethane paints will blister if kept in the water for more than a couple of days. I kept a painted boat in the water for a week each year, and tiny paint blisters covered the hull upon removal. They eventually dried out again, and surprisingly the paint layer wasn't visibly compromised once the blisters dried, but obviously the level of adhesion to the hull couldn't have been as good after blistering occurred.

You need to decide ahead of time if your boat will spend any lenthy time in the water before deciding to paint with polyurethane topsides paints below the waterline. If you day trip only, these paints will work fine below the waterline. But any more than overnight exposure in the water will compromise the paint job's apprearance & durability.

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