Filler over Epoxy?

M

moparmusclecars

I know barry recommends epoxy first than filler. Why exactly is this other than corrosion protection. Is it because, epoxy first - the curing process of the filler creates some heat though minimal and that could bring moisture to the bare metal? Also I hear others say they took a class on this stuff and were taught, Fillers are designed to be applied to bare metal. Before applying fillers over the epoxy, what is the recommended grit sand paper to use, or is the grinding marks i made earlier before epoxying enough?
 
For whatever reason, doesn't matter why, it will rust under filler applied over bare metal. Where I have seen filler cracked it was always over rusty bare metal. Back when ppg dp primer first came out people could not believe that it would stick better to the dp than bare metal. But epoxy has stood test of time. Back then we were still using enamel and lacquer paint too. My how things have changed for the better.
 
If I have 3 coats epoxy I da with 80 grit making sure not to sand thru. It has always worked for me. Then the 3 coats epoxy give me a little extra blocking room after filler is put on. Epoxy over sanded filler follows.
 
I have to wonder why anyone would need a reason other than enhanced corrosion protection. Preventing corrosion should be one of a repairer's top priorities.
 
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