Like XCross69 said, I think you just keep a couple of layers of good wax on there. My Dad just got a Honda Pilot and I picked up a bra for it and gave it to him today for Father's Day. The instructions that came with it say the same thing - to make sure it is well waxed and free of any debris upon installation. It does seem mighty inconvenient to take it off all the time and a lot of times when it rains you may not be able to attend to that right away. I think that if the area is prepped with wax and you make a habit of removing it and cleaning under it at least once a week, it's probably perfectly okay to just get to it when you can after it gets wet. I don't think letting one sit for a little while will hurt, but maybe if it bakes in direct sunlight for long enough and often enough. I never had a problem with the one I had on my Avenger. After seeing how one dressed up the look of the Pilot and noticing how I've been picking up little nicks through the clear coat on the leading edge of my hood, I'll be looking for one for my VX real soon.