schwartz.e36ti

Lay out headliner material flat apply a coat or few of headliner adhesive be as liberal with it as you want apply as much of a coat on your preferred side of door panel
Wait 30 minutes then apply another coat and put the two items together with some wieght spread out evenly
Wait 15 minutes for everything to bond
Cut off excess material and bingo bango bongo you have material on your metal door panels