Painting...

From what I understand, the sealer seals in the bodywork to prevent anything "popping up' or cracking under the paint. I am not sure if it is necessary, but it may be extra insurance. I am not sure if the sealer gets blocked. I would think not, unless it is laid on thick Also, my car had a lot of filler in the drivers door also, its amazing, my car is rust free, but still has a lot of filler to make it straight. I think it is something with the Dart /Valiant body where it takes filler to really straighten them out.