well, i've for the most part completed shaving my keyhole, (3 layers of fiberglass, then filled w/ body filler), but there's 1 little tiny ripple that I think might show up once it's painted. i'm using a sanding block, and have put on filler like 4 times, and that damn ripple keeps showing up! what else can I do????

 

you need to weld the hole up, then smooth it out never just fill it, It WILL CRACK