The invention relates to a kind of painting method that not only recycles abandoned ERP simply and effectively, but can make good waterproof quality colophony production. Mix and melt fine fibrin powder from wood, colophony powder from colophony material, FRP powder from abandoned FRP to form colophony of scheduled shape, and paint its surface. When painting the colophony shape production, first paint the surface with UV painting technique to make it thicker, and then take the same process again.