This worked well for me in a Mustang. Remove the entire inner roof liner.
Get a piece of vinyl larger than the old one and some sponge/foam rubber or
other padding. You can use pop rivets to tie the vinyl and padding to the
backing pieceLay out a neat pattern on the backer and drill holes through it
for the pop rivets. Be sure you put a row at the point where the backer
bends on the sides (most bend down slightly at each side). Lay out the
backer, padding on top, and vinyl on top of the padding. Use the backup
washers that are available to use with the pop rivets. and rivet the whole
thing together using the pattern you laid out. Squares or diamonds look
good. With a reasonable amount of padding, the pop rivets will nearly
disappear. You can't use the old headliner because it will be too small
(originally it laid flat, now you will have a tuck and roll effect) I tried
adhesives first and none worked. They all let go within a week or two.
Clean off the old foam as best as you can, then get a 3M brand spray-on
adhesive named Super Trim Adhesive 08090. It is specially designed for the
job, for bonding vinyl tops, heavyweight liners and hood silencer pads
where high strength and heat resistance are needed.
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