James Lister wrote: ↑Thu Feb 21, 2019 9:37 pmHow long did you leave the top after removing the first donut and gluing the second? This might have caused the problem.
I know some makers are switching to epoxy, but there's really no reason to. Luthiers have been using water based glues for centuries without problem. It's just a question of learning how to do it properly.
I had used a piece of wood as a caul couldn't really see the donut too well. So when I removed the clamps about 30 minutes after installing the first donut, I noticed the piece had slipped and immediately removed it, very easily with the mason tool (cigarette lighter to intermittently heat up the tool).
I just removed it again but it was a lot more work and I caused some minor damage. It looks like my rosette "diamond" tiles, installed with epoxy, maybe shrank and now I see much more visible black epoxy lines between each tile. Not the end of the world, but worse than it was.
Also a tiny separation where the two soundboard halves were glued together (titebond) at the upper part of the soundhole. Probably too much heat. I'm not too worried about this.
I now have the top clamped down onto a piece of MDF with a piece of plexiglass as the caulk (the hauser template).