kapnk
+1y
second on the contact cement. i used to build yachts and we used 77 for light simple contours. cement for everything else. i live in central florida and tried repairing a sagging headline by opening the edge of the headliner and spraying 77 in, let it tack, and then pressed it back into position. it worked... for about a day. interior temps down here easily hit 130's with humidity in the 80's and 90's. when using either, apply to both surfaces, let it tack(dry til it's tacky), and then join. personally, i would give the upholsterer $50 and be done with it. If there were no seams in the liner, i would do it myself. vinyl is very durable and easy to clean. that's why boats are chock full of it.