>hi larry bubbles between the glass and the foam none on the spar lines at >all just several on the foam! >cheers(Ross) ++++++++++++++++++++++++++++++++++++++++++++++++++++++=
Ross, I have no scientific proof but my THEORY on "bubbles" is that there was a dry spot under the glass at that point. If the glass is not bonded to the foam well and the top is sealed over with resin, primer, paint, etc., when the sun hits it and expands the trapped air it causes a bubble. I did my foam/glass layup in two steps. I first sealed the foam with slurry and let it cure. When cured I made one or two swipes with some sand paper to remove the "prickleys" and then laid up the glass. It makes for a less hurried one-man operation when doing the wings for one thing and I'm convinced the bond between the glass/resin and the cured slurry is just as good as the one step process. I've pulled cured glass off of foam that was laid up using the standard process (seal and glass at one time), my process (seal and let cure then glass), and glass laid up on foam with no sealing of the foam. I can't tell any difference on the amount of foam that peels off with the glass. In all three cases you get maybe +/- 1/16" of foam. So, to answer your question, I'd say yes to the resin and weight routine. Anything to get the glass to lay flat and bond to the foam should work. A glass to structure (spar, fuselage, etc.) bubble would be a whole different bag of worms. Larry Flesner
