The reason is, I noticed after I sanded the edges on my marine helmet that I sanded through the silver coat and the primer so now it has some pink spots, I didn't really sand hard but I guess the fact that the coats were light, just enough paint to get the color right. So I was thinking about putting silver paint in the bondo so if I sand to much it won't be pink.
Also to bring back a question I posted earlier in the topic: just to clear something up, To make a crackle finish, I could use a latex base spray paint and then after a few minutes put on the acrylic top coat?