Yes, they are pretty much fully under the 1/4" material, without coming out the other side. I use Weld-On #4, and with a jointer I cleaned up my edges first.
Using shims helped, but what seems to occur is as it cures, it sucks inward (shrinks) and creates air pockets down one side of the seam or the other. It was annoying, but I wanted to try it out. I'll keep at it in case it was just an issue this first time.
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Marc Levenson - member of DFWMAS
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