The mixing of body filler and it's hardener creates a reaction that results in the creation of heat. That heat against cooler metal then creates condensation at that level and since our cars are simply cold rolled steel without any galvanization, you'll get corrosion. By first applying epoxy on the steel before the application of filler, you'll have a water tight layer on which to apply filler. After using this process for over 30 years, I can tell you, it works!
|