What about some Engine paint Brian? If not then I will go to the hardware store and buy the railing paint that you mentioned. I think they have Silver Engine Paint and I am sure that will seal pretty good since it's heat resistant, etc so it must be strong.
Also is it true that undercoated is crappy stuff and not what they say it is? I hear that it doesn't seal moisture, that it's pointless to put over frames, etc because all it does is just cover up crap...

Is this true as well?
Thanks!