And that's the thing, people get caught up in the "one way is the only way" mindset. I watched a guy use that "special" bumper primer from the auto parts store on a plastic fender flare, and it started peeling in three months because he didn't scuff it with anything rougher than a dish sponge. Meanwhile I've got a buddy who just cleans the plastic with soap and water, hits it with some rattle can paint from the hardware store, and his truck bumper looks fine after two years in the sun. It's all about prep and knowing what you're working with, not just the label on the bottle.