I suspect you may be right Art. I used 'DAP Weldwood Original Contact Cement' to attach headliner trim on the surrey backlight for my TR4. When I brushed it on, I noticed that the vinyl material curled a little as the cement soaked it. But it became tacky and installed very well. I had it perfect I thought, then after just sitting there it pulled off the frame. I'm still disgusted by it, but it may not be the fault of the contact cement. My guess is the Weldwood solvent soaked into the vinyl a little too well, then when it flashed off over time the pieces shrunk a little which caused my problem. I haven't gone back to it also because I need to source a little more trim material for that section.