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I do have POR15 as well, but is it still recommended to seam seal first, or will the POR15 suffice?
You need to seam seal no matter if you use POR 15 or not. The POR 15 is to get rid of and encapsulate the rust, and the seam seal is to keep moisture from entering you car through the seams in your floor pans. Two different animals with two different jobs.