All-Metal has proven to be touchy in regards to the resin-hardener ratio with its unique and proprietary amber liquid hardener, not to mention the intentionally misleading name. Also, I don't believe it has been the beneficiary of new adhesion promotion technologies, which debuted in the market as Evercoat's "ZNX-7," but have now been licensed to all the major filler manufacturers. Correct me if I am wrong, though, I can't say I have seen a can of "All-Metal" in over two decades! For those that use it successfully, bravo, but I for one don't think it is a good product to recommend to beginners, or to anyone, for that matter.