POR 15 sucks...way to much prepping.
SEM has a product called Rust Trap...which will go ovah bare metal...without all the crap you have to go through with POR.
Leave that seam sealer ...and just go ovah it with some SEM 2 part seam sealer...let it dry over night ,,,then apply 2 coats of rust trap...30 minutes in between coats
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