This isnt a very good picture but a friend and i repleced the headliner of my old scarab. Its easier as a two man operation. I got the headliner from BoatUS. Its the shaggy type with foam backing. I got that cause the fiberglass was all irregular and i didnt want to waste my time sanding it all smooth. 3 cans of the 3M Trim Adhesive later it all looked great and we were both flying high!!! The headliner material only comes in 4' wide sections so we made the seam go right down the middle.
Make sure to put down some plastic on everything you dont want covered in overspray!! Last thing you want is trying to get off what feels like sandpaper on exposed parts! I got lucky and only missed one spot and goof-off took care of that no problem.