Cardboard Headliner Replacement
6 now you usethe hvac tape to fasten the pieces together first taping the inside then taping the outside.
7 now you can test fit the headliner
8 although the new headliner may need to be trimmed after you put the covering on it wait until you are installing it to do so.
9 now using spray glue starting with the center portion of your headliner keeping the glue off the sideboard portions, after the center is done pull the fabric out of the way to spray glue and stretch them carefully so as to not have wrinkles