Seam Sealer or POR15 or Both?

[EvilTwinATX]

I am planning on sealing my floor pans with POR 15. I have stripped all the old seam sealer crap out and treated the whole thing with acid to kill/convert the rust. Should I put new / better seam sealer down or just use the POR 15 and call it good? It seems like the POR15 would be more than enough...

 

[ShelbyDogg]

I've used seam sealer and POR15 both and you know what?  That POR-15 expands and fills gaps.  If your seams are tight,  I would paint it in there and look at it after 2 coats. I think the POR-15 might do a better job of pushing itself into the gaps.  With the seam sealer, I was pushing it around with rubber gloves to smooth it out for the factory look so you could probably use a little on top of your final coat of POR-15. 

I just painted a block with 2 coats,  then painted engine color on top of it. I'll find out how well it resists heat. The POR-15 gets real thick so put it on thin.

[700HPCharger]

I am using seam sealer with Eastwood's Rust encapsulator(which I think is better than POR-15). Overkill is better than having to redo it all again in a few years.