John; Interesting enough, I just finished the roof of mine yesterday. I wire brushed the roof in which most of the dried foam came off rather easily. I then put a sheet of dynamat to the roof, and smoothed with a roller. I am also going to put a very thin pre-glued foam over the dynamat. I will then put a headliner on over the foam. My thought is to have the foam very smooth to have a very smooth headliner. In my opinion, to glue a headliner to the roof, the roof should be as smooth as prepping to paint.
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