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post #1 of 6 Old 04-03-2010 Thread Starter
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Varnish blister?

Here's one I haven't experienced before: in two places on the exterior woodwork (one on the toe rail and one on the inside of the cockpit coaming) there have appeared 1 1/2" blisters. The varnish swells up with air and looks just like a blister from poor fitting shoes. It happens on warm sunny afternoons. I'm assuming it is due to moisture under the varnish, but this is a first-time occurrence in over five years of ownership of this boat in the same environment, with the same Epiphanes varnish applied every 4-6 months.
Has anyone seen this?
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post #2 of 6 Old 04-03-2010
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At least you know that your varnish is a good vapor barrier!
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post #3 of 6 Old 04-03-2010
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Those blisters are likely caused by painting in direct sunlight on a hot day. The varnish skins over and dries trapping wet varnish underneath.
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post #4 of 6 Old 04-03-2010
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Yes

Yes, I have. Unfortunately it's time to get out the old heat gun and remove the old varnish. It has lost it's hold on the wood and will only get worse with time.


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post #5 of 6 Old 04-04-2010 Thread Starter
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Thanks for the ideas...
It is almost time for the spring re-coat, it will have a bit of extra attention in a few areas. I think you are correct Dwayne; the blisters look like its all the way detached from the wood. Hopefully a complete removal of that area plus an inch or so will suffice. If not, well there's another six week project to add to the list!
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post #6 of 6 Old 04-05-2010
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This has happened to me also. I'll bet that when the first coat was laid it was a very warm day and perspiration dripped of off your nose onto bare wood. If a drop of moisture lands on already laid dry varnish and you hit it with the brush (especially foam) it will turn into a bunch of tiny droplets and very tiny bubbles. On dry wood one must be very careful and use a tac cloth or non -lint tee-shirt material.
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