|
Author
Text
09/03/2013 11:50AM
AARGH!! Glassing the interior and kept getting a bunch of tiny air bubbles coming up, especially but not limited to the staple holes. Anyone else get this? After I was done I would have to come back every 15 minutes or so and brush them out.
JD
JD
09/03/2013 12:53PM
Remember wood breathes. When the air warms up wood exhales because the wood is getting warmer (bubbles). When the air cools wood cools and inhales (sucks in varnish or epoxy).
Good luck.
Good luck.
"In wilderness is the salvation of mankind." Thoreau.
09/04/2013 02:22PM
The air bubbles issue is called outgassing. Your wood has to be warm and then cool as you glass the inside. It's too late to fix this but you need to pop the bubbles as they form and then fill in the craters with dabs of epoxy after you're done glassing. If the wood goes from, say, 80' to 65' you would have no bubbles whatsoever. If you reverse those numbers, you end up with a thousand bubbles.
-T
-T
09/04/2013 03:27PM
Yes, a cooling temp is best. This can be demonstarted easily by doing a test panel and placing a light bulb a couple feet away. You will see bubbles form just in that spot. You'll notice the inside is worse than outside because air could escape through the inner hull when the outside was done. Another option is to precoat the inside with a thin layer of epoxy before coating. Lots of info on this topic can be found on the bear mountain boats building forum.
Best overall approach is to glass the boat with slightly warmed epoxy in a a room with a dropping temp.
Moonman.
Best overall approach is to glass the boat with slightly warmed epoxy in a a room with a dropping temp.
Moonman.
09/05/2013 12:12PM
quote Moonman: "Yes, a cooling temp is best. This can be demonstarted easily by doing a test panel and placing a light bulb a couple feet away. You will see bubbles form just in that spot. You'll notice the inside is worse than outside because air could escape through the inner hull when the outside was done. Another option is to precoat the inside with a thin layer of epoxy before coating. Lots of info on this topic can be found on the bear mountain boats building forum.
Best overall approach is to glass the boat with slightly warmed epoxy in a a room with a dropping temp.
Moonman."
I agree with everything except adding the pre-coat layer. This adds weight to the boat and does not eliminate outgassing.Just let the work space cool slightly as you go to eliminate the problem.
Tom
Subscribe to Thread
Become a member of the bwca.com community to subscribe to thread and get email updates when new posts are added. Sign up Here