I have 76 and 90 and I think both will delaminate fairly quickly. But I have to warn you even the very strong 3M 90 isn't going to give you a great bond. 3M 72 or 90 would be much stronger on poly. Here is some info on the adhesive backed Dual Lock:ģM 76 is very unlikely to work well. I contacted Pelican Cases and was told that their cases are indeed made of polypropylene and to adhere foam cushioning they use 3M 76 Spray adhesive. I've decided to get a yard of non adhesive 6" wide Dual Lock (SJ3780/black) for stitching to leather and three yards of 2" wide VHB adhesive backed Dual Lock for attaching to the polypropylene case (SJ3550/black or SJ3560 clear). I was getting set to make some compromises. I just don't recall and the glue is in a box in the shop. I have some 3M adhesive that is designed specially for polys. ![]() You need a glue specially formulated for this type of material. ![]() Polypropylene is VERY VERY hard to glue especially if it is structural. I would definitely try VHB if you have some. I should have a surplus of this Dual Lock, if anyone is interested. ![]() The other side will have to be glued onto a smooth hard plastic (polypropylene?) case.ĭo you think Dual 88 contact cement would be enough, or is there another type of glue I should try? I've never tried 3M VHB (very high bond) double-sided adhesive tapes, which I think is used on a variety of the adhesive-backed 3M Dual Lock strips. One side of the strip will be stitched onto leather cases. I'm about to purchase some non-adhesive heavy-duty velcro (3M Dual Lock) strips.
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