69cuda340s wrote:A DA will not make the straight. If fact it will probably do just the opposite. If you want it straight get a long DuraBlock and block it by hand. Once you start blocking you will see the panels are not straight, the sand paper will not be hitting consistently across the panel surfaces.

I would sand doors, fenders, hood, trunk on the car where they are stable and wont wobble around.

Methodical wrote:69Cuda, I was not clear. I do not plan to use the DA to block the car. I was asking if using a DA is ok to prep the car for primer (i.e. sand to factory primer faster than by hand). I will epoxy and then spray build primer and definitely block sand by hand to get things straight.