[Perfectlap]

use some clear box tape around the edges to reinforce it. I've forgot to remove my numbers after one event and didn't realize it until after I was on the highway and they didn't blow off. The first time I used my numbers I did notice some light marring of the paint from the magnets which came out with some Poorboys SSR 1 (by hand). I'd probably stick some wide width blue painters tape to the area of the doors before sticking the numbers back on again. and add some wax to the door in the future. Which ever magnetic numbers you use it would be wise to do this.

p.s.
magnetic numbers won't work on your hood since that part is made of aluminum.
Find out if you do need numbers on the hood. Be careful storing the numbers and do so on a flat surface you don't want that laminate to bend