Wet Sanding with Dura-block or paint stick?

I use EVA on the long board cut to get it nice and straight. 2nd prime, I hit with P600 on an EVA hand , use half sheets, fold and torn down the seam, until the guide coat is gone. Then, I come back in with guide coat and hit the entire car with the same P600 on a flexable foam block, both to knock out any ridges that the more rigid foam can leave and get concave areas without leaving any gouges.

A second overall pass leaves a flatter surface than just sanding until the guide coat is gone, on the first round and with the flexible block, it is less likely to leave any ridges.