You can get JBWeld at just about any hardware store in their glue sections.
My upper outlet broke off half way in two pieces. I first glued the two pieces together and waited over four hours until he glue was hard. I then took this subassembly and attached to the radiator itself. I made sure there was glue both inside and outside the neck and where the two pieces joined.
I used strapping tape with considerabel pressure to hold the pieces together since I didn't have a clamp that quite fit the application.
I also cleaned all the areas well to make sure there wan't any antifreeze around which could hurt the gluing process.
BTW, don't get the JBWeld Quick dry. It only goes to 300 degrees F and isn't as strong as the regular JBWeld.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)