The generic Glyptal I used a few years ago is still OK.. no pealing, cracking etc. I just refurbished a mower deck 2 months ago. I sand blasted it, sprayed phosphoric acid on the bare metal, let set, washed and then applied Rust Bullet paint to the underside. I did not sandblast the underside (just the top of the deck). Anyway.. that rust bullet is some good stuff. NO grass sticks to the underside of the deck. I've used just about all the miracle rust paints out there. Por-15 is probably the worst of the batch. I've been using Rust Bullet for about 10 years or so and highly recommend it.