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Can NuMetal Epoxy Putty be applied over Rust Seal?

Yes, you can apply NuMetal Epoxy Putty over cured RustSeal (24 hours) by scuffing up the RustSeal with 320 grit (or similar) and then applying the NuMetal Epoxy Putty.

TIP: Sealing up a metal surface first with RustSeal before applying NuMetal is a great idea, so rust does not form below the NuMetal and potentially cause it to pop off.

Please read the complete NuMetal Application Directions before you begin your project.