Can anyone comment on which is better? Are they both easy to work with and paint over? When I strip my 65 Fastback down I'd like to coat the floorpans, engine bay etc before applying other paint.
Having only used Por-15 and reading Rust Bullits instructions, I suspect they're both about the same (regardless of biased manufacturers "independent test" claims). The practical difference between the two is the additional step Por-15 has of treating the metal with Metalready (Hydrochloric Acid) which leaves a Zinc Oxide coating. After you apply Metalready, you have to rinse it off with water which results in minor surface rust that you paint over. Extra labor? -Yes. Worth the Extra labor? - No idea.