Mark, I've been using the Vagias keytop almost exclusively for the past several years and am so far unaware of any problems with the sets that I've installed. ( knock on wood ) I think they enhance the looks of the more vintage pianos best. As for gluing I admit that I was a contact cement guy for nearly 15 years, but I now swear by the PVC-E laminating adhesive particularly the brand GlueRite distributed by The Piano Shop in No. Salt Lake. With a thin coat on both surfaces this allows for a more accurate placement then you would get with contact cement. Best of luck, Paul Gates RPT Farmington Ut.
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