Oracal 3640 — Soft Calendered PVC ? WITH LAM BE OKAY ?any calendared vinyl with permanent adhesive will do. Be sure to laminate them.
While I too prefer matte, it 'holds' a lot of dirt that would wash off of a gloss finish more easily.We typically use 3M products, so I would use 3M Ij35C with a matte laminate (just because I prefer a matte finish - it's really up to the customer on the finish).
Man have you seen the kinds of cars belonging to folks who still buy bumper stickers? They leave them on until the car falls apart, to the point the bumper sticker is holding them together. Their entire belief system is held up by that bumper sticker, and to remove it is an act of war.I would also consider using regular calendared material with removable adhesive. And not laminate it. Unless they want people to leave the bumpersticker on for many years. But people remove political campaign bumperstickers and saddling them with a huge wad of permanent adhesive just isn't very kind.
I have had stickers on telephone poles here in Maine stuck on there for 3 years without any problems using Substance 2755/3150.While I too prefer matte, it 'holds' a lot of dirt that would wash off of a gloss finish more easily.
For bumper stickers, I'd go with some of that fantastic substance pm3755 with matching laminate. It's twice as thick as ij35, taste the same, but smells better. Also it's usa made so for the moment it's tariff proof!