[transmaro93]

Ok think I got the gist of what your asking. You can do it either way. You can fill right over bare metal but for long term projects leaving the metal open creates opportunity surface rust and other contaminates. Dp90 is a great product and what I would use if I was stripping a car down. Epoxy prime pretty much seals off the metal and create a great corrosion resistant base. You CAN do body work over dried dp. I would sand areas to be filled with 100grit. Then do your filler process. They you can spot hit any bare areas with dp or just prime with a direct to metal primer surfacer. Then sand and paint. If this is going to be a show car you could do the extra step and polyester prime the whole car and block all that down for paint.. then you seal and lay color then clear... hope this answers your question