It must be pre-painted in advance and keep the surface clean.

有机硅防污涂料系统对表面清洁要求很高，这些必须清除干净。

youdao

It must be pre-painted in advance and keep the surface clean.

有机硅防污涂料系统对表面清洁要求很高，这些必须清除干净。

youdao