I wasn't clear on that, sorry. I meant the 3M 08001 "Gorilla Snot" glue. A lot easier to apply than all the masking work I went through. My headliner was cardboard backed, iirc. Not corrugated, about 1/8" thick. I got it from NPD in Ventura, which is about 30 miles from me. Take the wife to the beach, get lunch and truck parts.