I am in the middle of a restoration and have little experience. I have done one other job that turned out really well but was a large learning curve. I have some panels that I have blocked the first round of high build primer with 80 grit and they are really close, just a few minor low spots. After the second coat, do I use the 80 grit again to get it all even and then go to 150 then say 400? I guess I'm asking what sanding steps you guys go through to get it right and will I need a third coat? The last one I did I blocked the whole truck three times from start to finish with 400. It worked me to death and I'm sure it could have been better but it turned out really nice.