How can I make my slant six exhaust manifold look great?

I used VHT 2000 degree "Flame Proof" paint on mine. Blasted it, primed it with VHT 2000 degree primer, paint it with VHT 2000 degree paint and cleared it with VHT 2000 degree paint. That was only two years ago. It's starting to rust through now. There's nothing you can do that'll last 20 years and still look great.