Both cars that I bought had dash mats. One was glued the other was not. The glued one was much, much, better. It sat very flat and looked great, well as good as a dash mat can anyway. I would not recommend PL, it is probably to thick and is not a "contact cement". The best stuff will be contact cement because otherwise the mat will not fit tightly to the contour of the dash. Home depot has some really good stuff that is marked both "outdoor" and also "marine" contact cement. It comes in a tube and is bubble packed. I apply it with a short bristle glue brush---just cut a long bristle one down. It works great for door seals and stuff too, it's clear.