Quote:
Originally Posted by pottsalot
Ospho is an acid type option to rid the rust. Hard to tell by the pictures how deep the pits are. Check out a product called All-Metal if epoxy won’t fill them in….. Easy to work with . Great for car body work as it will not let base metal rust under it like bondo does.
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USC All metal and the Evercoat Metal2Metal is simply ground aluminum in a polyester filler base. It's body filler. That's all. It's a gimmick type product designed to look like lead. It was originally marketed to be used on A and B pillars of American cars when a quarter panel or roof skin was replaced. Lead was used there by the OEM's and those two fillers were marketed as a replacement for lead. It's not a product that will stop rusting of metal under filler.
Epoxy applied first to bare metal then any filler work over epoxy is the modern and best way to apply filler. Mercedes has been requiring that any repair involving filler be done over epoxy since the mid 90's. All OEM's recommend that process now. Epoxy first then filler will last many times longer than filler over bare metal. Adhesion is greatly improved as well. Really the only way filler should be used on anything of value or importance.