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You'll mostlikely have some bare metal showing after sanding your filler work, these spots will need to be shot with epoxy or you can shoot a coat over the complete panel-the choice is yours. Yes the filler will absorb faster and more than epoxy but when you're applying a 2K surfacer that's really nothing to worry about if you're planning on letting the primer cure well before sanding. Your first coat of 2k might show where the filler is but usually after applying the second coat this will disapear.
 
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