I painted cab,frame and engine in order to work over the winter on brakes and getting engine running with all new parts gas pump, water pump,etc. I zero rusted frame and top coated with ak enamal. I striped cab,doors and other parts sanded with 40,80, 120 and then acid metal prep. I epoxy primed the cab, doors and other parts and then coated with 2k primer surfacer. I won,t be getting the bondo [skim coating and small repairs untill spring. Can I scuff sand the 2k and then bondo over the 2k ? if so what do you recomend for scuff grit and which bondo is best? thanks in advance, and any suggestion are welcome.