Paint isnt porus, its why we use paint, to seal off the primer sealer, so moisture doesnt penetrate to the metal.

You dont have to put bodo directly to sanded bare steel, PPG recomends to put down their DP epoxy sealer down first ( over bare metal) before you apply your body filler.( Trust me I've been to enough of their schools to know ).

I see you live in FLA. where Humidity is high, I wouldnt leave my bare steel open for very long as it will start surface rusting pretty quick.


Spray