POR15 stuff is awsome, I've used it in the restoration of my Impala. Everything I've used from them works really good.

Zoop Seal is kind of spendy, but I have heard great things by some british bike owners. Easy to apply and lasts a long time too.

2005 Ford F150 SuperCab FX4 1964 Chevrolet Impala SS 1998 CSVT: 354HP/328TQ @ 10 psi, now gone