From Appiedmetal's site:
AMT is a patented process that seamlessly applies cold spray-able METAL to almost any surface. AMT is NOT a paint. Available in nine metals: Aluminum, Brass, Bronze, Copper, Iron, Nickel-Silver, Stainless Steel, X-Metal and Z3. AMT is applied using a process that has been perfected and patented. AMT gives almost any material the appearance of being a solid cast metal object without the weight. The patented AMT spray-able and cast-able metals allow a thin layer of 95% pure metal to be applied over any substrate, in virtually any design or configuration. AMT looks, feels and acts like hot-cast metal, yet there is no heat used in the process.