Its pretty tough stuff. It has a heat and cool rate similar to steel. Prob never crack out. Have 2 spots in windshield lower corners i had to use a rotary file to dig out the lead, and there was surface rust under there. Currently letting naval jelly eat it out. I will use JB weld in place of the lead i ground out of there, and rework the opening so the windshield stainless fits good.
