I let it "dry" for 3 days before putting a top coat on. My plan was to sand the rusty areas with a 3M wheel and then brush apply Rustoleum Metal Primer and then a topcoat. An epoxy primer cannot withstand UV ray as good as urethane. I ask because I do not have the equipment or place to do an over-all primer job, and I want to protect the few areas where I have done body work, and a few sand-throughs from rust until it can be overcoated completely with an epoxy primer. It makes a good uniform base color for the top coats. ... galvanized already and I painted with a good coat of Metal paint. A good epoxy primer is better in all aspects with reguard to putting new paint on a vehicle. For rusty metal, I use Extend a product the uses a little phosphoric acid in the mix to convert the rust to iron phosphate, and also is a good primer. SO far so good. Rust-Oleum calls its brand of rust converter Rust Reformer. It's easy to use and it's easy to top coat. Zinsser® Bondz® is specifically made to adhere to heavy and dense surfaces, and it [is effective on] about 90 to 99 percent of all metal substrates.” Putting on a proper coat of primer means that nearly any type of … Rustoleum says only use latex paint for a top coat. Epoxy primer can be applied on either new bare or old rusty metal surfaces and is compatible with top coats made up of other substances. For smaller jobs I am fond of Rust Tough acrylic enamel, although at $6.00 a rattle can it is a little high. The stuff will not allow new rust to start ever. Make sure the item you want to paint is dry. I follow with Rust-Oleum Rusty metal primer, the red oxide type, then top coat. I did both of mine with Rustoleum "rusty metal primer" - the brown stuff (with whale oil!). Read honest … Find helpful customer reviews and review ratings for Rust-Oleum 7769730 High Performance Rusty Metal Primer at Amazon.com. Sanding or simply washing with paint thinners or soapy water is the best way to prepare the surface. https://www.hunker.com/13412927/how-to-paint-rusty-metal-with-rustoleum I brush it on to work it in. Once it's clean, prime the item with Rustoleum primer. One was brushed. However, there is one downside to epoxy primer. “You need a primer that will match the surface. For maximum protection, top coat with Rust-Oleum finishes ... Rust-Oleum® Rusty Metal Primer provides the best base surface on heavily rusted metal for most brands of automotive lacquers and enamels. Rustoleum's preparation guide recommends removing dirt, grease, oil and chemicals as well as any chipping paint or loose rust. I have used it on wood, painted surfaces, rusted surfaces, aluminum yellow chromate primer and even bare metal. You can basically use epoxy primer on both the frame and the body, as long as you are going down to base metal. Well, I found Krylon H2O latex spray but I dunno. 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