Well the headliner is done, not the best job but none the less it is behind me. First I tried 50/50, water and household ammonia. Thought I had it wet enough, tried to install it and realized it was still too stiff. Start over again next day. 50/50 water and household ammonia again. This time I thought for sure it was wet enough (as Joe said, those compound curves are tough) tried to install it and still not successful. Decided to see how wet (soft) I could get it by using a hose and letting water run on it for several minutes. Surprisingly, the running water must have removed the ammonia (the headliner was still damp from previous installation attempt) because the headliner actually became more rigid even though it was just short of being immersed in water. Next day I decided to try some higher concentration ammonia that I use for fuming wood. Might be 28%, it is used in making prints (paper, like blueprints). Again 50/50 but with the much stronger ammonia and headliner softened much sooner and to a greater degree allowing me to get it installed. Anyhow this wraps up my experience with fiber board headliners. Ralph