I'm building a board with my brother, and we did the bottom lamination yesterday evening. We're using 4oz cloth with epoxy with a yellow pigment over a polyurethane blank.
Everything looked fine when we finished the lam, but a few small bubbles came up subsequently. They're not "foaming"-type micro-bubbles, but more like small ridges where the the glass has just lifted slightly from the foam. I'm not even sure that there's air in them - they may be filled with resin.
Also, and I'm not sure if the problem is related, there is also a very small bubble running along the stringer (there is definitely air in this one). I have read about stringer out-gassing in the archives, but we glassed in the early evening with falling temperatures; and also I've previously done a board with the same type blank and had no problem with out-gassing on the stringer.
So, 2 questions:
1. How do I make sure that we avoid the problem when we do the deck?; and
2. How do we deal with the bubbles that are there now?
Regarding the second question - the bubbles are small enough that if the board was for me, I'd just carry on and do the fill coat. However, the board is for my brother, and he has really high expectations on how this is all going to turn out :-) (As it is, this board is way better than the previous board I did, at the same stage.)
Any assistance will be appreciated.
Tim