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My only guess is some sort of contamination.
John
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John, that might be likely--the bubbles formed in two rows, about the width of the brush apart. I used a fresh brush each coat.
Weird.
Semper fi,
Brad
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If this is oil based spar varnish, then make sure you gently stir it and not use a drill mixer or shake the can.
I get bubbles in oil based finish, but if it is not too hot the bubbles work their way to the top and pop on their own. Applying the finish in the sun would prevent that from happening.
Use a good brush or a foam brush. The foam breaks down from the oil based finish's solvent. It is not a problem on small jobs, but plan on more than one foam brush for larger jobs.
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was this in water before?
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No, this is fresh wood, stored in my shop for a few years. It's a new build.
The application was done in the sun. After popping the bubbles and recoating, they didn't show up again. It's ugly, but it's sealed. I'm happy.
Semper fi,
Brad
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It does look like contamination. Bubbles everywhere + finish issue. Bubbles random = contamination. In my experience anyway.
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The oil in the finish absorbed into the pores of the wood while the finish cured. The finish was not fully cured before you applied the next coat. The previous finished heated up and expanded creating the bubbles as it off gassed.
Any free advice given is worth double price paid.