Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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Jerry
When I am using several different veneers together, in the vacuum bag on top of the project and a layer of plastic sheet I'll spread a thick cotton canvas, some use a thick rubber sheet. The top caul goes on top of the canvas/rubber.
The canvas/rubber is intended to compress enough over any thicker veneer to approximately make co-planar the backs of the various pieces of veneer so there is a more even layer of adhesive between the veneers and the substrate.
You can find the "bushing" canvas in the on-line store at www.schurchwoodwork.com and details on the rubber sheet by searching on this forum.
If you are going to try either the canvas or rubber, I'd suggest a test using a marquetry pattern with your usual veneers; after the glue has cured, cut into pieces and try to pry off the different pieces to see if you obtained good adhesion throughout.
Personally, I wouldn't be comfortable troweling Durham's over the back of an assembled marquetry pattern.
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