Originally Posted by cntgetm3
Is that glue or tape? And I need to leave it in the sun? Should I wash it first?
The 3M adhesion promoter is a liquid that you wipe the area that the 3M tape will be sticking to to make sure it gets the best bond possible. Yes, you need to make sure the area that's being taped is very clean before installation. Leaving the car in the sun first will allow the bumper to get more flexible to help you with making sure the diffuser can form to the bumper as best as possible.