When i bought my s10 there was no headline so i got one from the junkyard out of a different s10 but with red(instead of black) fabric on it...so i went to the fabris store and got some black cotton or something fabric to cover it and sprayed it on with some 3M spray, but i went out to my truck today (which has been sitting out for about 1 week withou being opened in some pretty hot weahter) and i noticed it was sagging down in some parts so im gunna take it off and redo the fabric but what should i use to kept it from saging....thanx in advance..