I have been trying to find some kind of rust protection for the underside of my 67. I think this the best solution i have found!

After neutralizing the few rustier areas i am going to use this AMSOL Metal Protection product. Any of you guys know of it?
http://www.synthetic-solutions.com/mphd.asp
http://www.synthetic-solutions.com/mp.asp
I am not sure which one is better for my situation yet