Thanks Fimum Fit. My leak is at the top right part of the radiator, engine side, in the tiny fins. It spits out coolant onto the windshield washer tank and then puddles in the lower fender. I could clean the green stuff off ( corrosion? ) with baking soda and water using a toothbrush and then try to force the JB Weld into the fins. Might work........I've used JB Weld to fix a leak in a gas tank, worked fine.