I used (RustOleum 7769502 Protective Enamel Paint Stops Rust, 1 gallon, Flat Rusty Metal Primer) it took 3 gallons to cover the entire outside of the 18 ft trailer. I used a low nap 1/2" roller cover. I used automotive bondo to fill in any holes and to make it look cleaner. I also painted primer on the interior side of both doors. The video shot of the top of the trailer was after I sanded/power brushed the entire exterior of the trailer and was using a scrub brush and water hose to rinse the dust off before primer paint. I bought this trailer for $425 as is, as you see in the beginning of the video. After working on it for almost 2 days, I sold it for $1,700. I made a quick $1,250. I bought it to flip which is what I do for a hobby. Hard to work and film with one hand though!