The ceiling clothing becomes loose at the front and rear windshield. I know this is a problem many PA's have. But what kind of glue to use, so the glue doesn't leak or shine through the thin fabric?

This happened to my PU and I used 3M spray adhesive with good results.

Regards,
BPA

It is only around the edges. Would contact gel like this work?

http://www.nedis.com/images/products/PE-BISONTIX.JPG

It might, but I would not use it. There is a spray adhesive for cloth. That stuff to me seems like it would be way to globby and likely to go through the fabrick as you mentioned.