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 Sheet metal ash is a kind of inlay material developed rapidly in the world in recent 20 years, which makes the once backward automobile sheet metal repair industry achieve a leap of the times. Sheet metal putty is mainly used to fill and modify the defects of substrate, such as pits, pinhole, cracks and small welds. It can be directly applied to the surfaces of galvanized steel, aluminum parts, stainless steel, imported unknown materials and automobile hood surface, so as to ensure the smoothness and smoothness of substrate surface before topcoat. Sheet metal putty is widely used in the fields of train manufacturing, ship manufacturing, bus manufacturing, engineering machinery manufacturing, machine tool and mechanical equipment manufacturing, automobile repair, furniture, mold, concrete buildings and all kinds of metal products, wood products, FRP products that need to be filled and repaired.