Q: I have used some contact cement to glue veneers, finished them, and several days later I had some bubbles where the adhesive had let go.
A: Did you know that contact cement is dissolved by the aromatic solvents in stain and lacquer?
I suspect that this is what caused the problem. You will have to look for a different finishing system, perhaps water-based, or evaporate the solvents before they can break down the adhesive.
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