Sealing Floorpan after Sandblasting - What Primer?

[JMarsa]

I'm going to have the rear wheel wells and trunk area of my Nova sandblasted soon in preparation for a min-tub. Afterwards I'll obviously need to primer the area to prevent rust. Is it better to use a etch primer or regular primer when there is welding yet to be done in the wheelhouse area? I'm concerned about 1st preventing rust until the work is complete and 2nd making sure the welds are clean (free of contamination). I've never had to sand etching primer so I don't know how tough it is compare to regular primer when prepping the areas to be welded.

Another question, does it make sense to etch prime the underside and then use POR (or similar) or another combination? I'm not planning on painting the underside, just a rust proof flat black.



Thanks in advance,


--JMarsa