Don Stephan
 Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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I might be all wrong, but gluing the medallion in two steps sounds like it could create problems, as it seems possible for the assembly not to be uniformly flat. Clamping the assembled medallion to a substrate then would either have voids between the medallion and substrate or crack some of the joints between inlay pieces as it conforms to a flat substrate.
I have used two part urea formaldehyde glue for plywood joints with no failure when I needed a long assembly time. The mixed UF was poured into an old glue bottle, squeezed onto the edges and spread with a glue brush. Worked very well. Depending on how long it takes to edge glue the pieces of the medallion perhaps you could glue the pieces together and to the substrate in one operation. Granted, there's a chance one or more joints might open up when the medallion in flattened against the substrate if they were not milled perfectly, but blue tape would pull the edges together regardless of the type of glue used. Another option would be to glue the medallion pieces together as you are now, then flatten the bottom on a wide belt sander. Still a risk of cracking a glue joint ...
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