How to improve surface hardness and stain resistance of BMC products?

Some customers put forward the surface requirements of BMC products: the friction resistance without marks or the color of the friction surface should be the same as the original color.However, in the actual production process of BMC products, the scratch color of general BMC products is white, and the scratch color is quite different from that of the original BMC products, which affects the appearance of BMC products. The customer does not accept this phenomenon, and it is generally changed by rubbing white oil or painting.Do not know what causes the scratch color is always white?Whether it is related to the surface hardness of BMC products, whether it is easy to produce surface scratches due to high surface hardness or easy to produce surface scratches due to low surface hardness.

What causes the scratches on the surface of BMC products to be white?

Is there any way to solve the surface defect of this BMC product?