2 part urethane--failure - SailNet Community

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  #1  
Old 11-23-2005
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2 part urethane--failure

recetnly did all my teak. Scraped and sanded to perfection. First coat was West epoxy, w. 10% laquer thinner, then 3 coats of 2 part urethane. The three coats went on within hours of each other, as per instructions on the label.
This coating failed badly. It turned semi-opaque (kind of milky-looking) in a lot of places, and in other places it is peeling.

Other than moisture in the wood, what are the possible causes?
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Old 11-23-2005
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2 part urethane--failure

Bad paint brush operator!
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Old 11-23-2005
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2 part urethane--failure

I just did a quick check on the Gougeon Bros. website and lacquor thinner is not one of the chemicals they say to use for thinning. Lacquor thinner is recommended for clean up, however. I have a feeling your epoxy base is compromised as a result, but that''s only a gut feeling.

Why thin the one epoxy coat at all? Or why use epoxy at all for a base coat?

You also didn''t mention what the 2-part product is (Bristol Finish perhaps?) you used for the top coats. Whatever it is, be sure it will bond to epoxy if you insist on using that as a base. And if you use WEST, be sure to clean off the amine blush and rough up the surface with sand paper. MAS eposy with their slow hardener would be a better choice (no amine blush with the slow.)
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Old 12-25-2005
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2 part urethane--failure

Lacquer thinner was the WRONG thing to use to mix with the epoxy. If you must thin epoxy (and normally it is NOT a good idea) the only solvent recommended is acetone, and not much of it!

I believe if you go and look again at the technical information published by the makers of WEST eposies you will see that lacquer thinner is used to clean up and that is all.
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