The epoxy is made by Permatex. This is the product I used. Dries in
grey color.

http://www.permatex.com/products/Aut...etal_Epoxy.htm

Also the boiler is only 2 years old, but the piping I'm sure is a lot
older. Fortunately the problem pipe can be removed since there is a
union fitting not to far from it, so its not like I have to
disassemble a lot, but it is very heavy pipe, at least 2" and 2-1/2"
steel piping.