Can body filler be used over Zero Rust? I know it can be used over DP 90.Should I DP over the Zero Rust then use filler or can it be applied right on top of Zero Rust? Should the Zero Rust be scuffed up before applying filler? I don't like applying filler over stuff but I have some deep pitting in my wheel wells and I sanblasted them and I was kinda wanting to apply some zero rust just to make sure I stop all the rust in that area. What do you guys suggest.