Thanks Kevin,
I looked around and found some that was 30%. I'm thinking this would be good in the radiator but I'm not certain it would be strong enough for the engine. I probably should have taken chemistry more seriously when I was in school. I know there is some acid out there strong enough to dissolve this stuff but don't know what it would be.
Jon


~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end