Agree with Carl here, it will save both time and money in the long run.
Best of all store your primed parts in a low humidity area, not a dirt floor out building.
When the time comes scuff up your primed parts and proceed with body and fill work.
Seal your primer before painting base or top coats.

Some people prefer to do body work and filler on bare metal before epoxy priming in this instance you can prime with a thin etch primer that will sand off easy when the time comes.
I'm not a professional but merely telling you what has worked for me.

Etch primered parts should sit a couple weeks before epoxy primering, or it can cure quicker if put out in the sun.

Last edited by sstock; 04/22/2020 2:02 AM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration