JB Weld Plastic Radiator Tank...?

Have any of you successfully JB Welded a plastic radiator tank? The radiator shop wants $70 to put on a new tank, and the salvage yard wants $60 for a used one.

Also, this radiator does not have a cap? Is there a pressure release somewhere in the system?

Thank you, Glenn F.

Thank you to each of you who so carefully and thoughtfully respond to my questions. I need you folks.

Glenn FitzGerald

I drained the coolant down to below the crack a ways and then cleaned the area very carefully with carb cleaner and then lacquer thinner. After it was dry I roughed up the bonding area with coarse sandpaper. I applied the mixed goo with a popsickle stick with the radiator still in the Mazda. The goo set up in about 15 or 20 minutes and I refilled the radiator 24 hours later. It held pressure for a year. If I had it to do over, I think I would have added a metal patch over the epoxy, or even epoxied the popsickle stick over the crack, since it looked to me like the repair flexed where it had previously cracked.

You wouldn't be out much trying to repair the tank, especially if the car doesn't have to be used right away anyway. You might want to check out your auto parts store for the specific kit--it might be something different than JBWeld that might work better. And then it might not work well at all, depending on the tank material and the location and nature of the crack.

I usually try repairing something first and if that doesn't work out, I replace what broke or wore out. Good luck!