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 Sheet metal ash is a rapidly developing filling material in the world in recent 20 years, which has made the once backward automobile sheet metal repair industry realize a cross era leap. Sheet metal atomic ash is mainly used to fill and decorate defects such as pits, needle shrinkage holes, cracks and small welds on the substrate. It can be directly applied to the surface of galvanized steel plate, aluminum parts, stainless steel, imported unknown materials and the surface of automobile hood to meet the flatness and smoothness of the substrate surface before the top coat. Sheet metal atomic ash is widely used in train manufacturing, ship manufacturing, bus manufacturing, engineering machinery manufacturing, machine tool machinery and equipment manufacturing, automobile repair, furniture, molds, concrete buildings and various metal products, wood products, FRP products that need to be filled and repaired.