If you already have the POR-15 just prep as well as you can and paint over the seam sealer.
What’s it gonna hurt?
I’ve used it on rusty trunk pans and floorboards with great success, even over some painted surfaces and it hasn’t peeled.
After more than 25 years since applying it it’s still doing just fine.
Are there better products, probably but I haven’t had anything like peeling or any kind of failure using it. I’ve used it on front frame rails that weren’t terribly rusty, a core support that had been chemically dipped for rust and paint removal and an entire front suspension that I bead blasted clean and it’s been great.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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