[76GMC1500]

JB Weld works well for radiator type repairs. I've used it to build up and repair pinholes in a corroded magnesium water pump housing. I initially used a typical fast cure epoxy which failed quickly. Upron reading the product data sheet I saw it had a max temp rating in water of 120F. The surface was even bead blasted and I was able to simply peel out the old epoxy. I did it again with JB Weld and it's lasted nearly 2 years and is still going.