On October 22, 2020, on a sunny day, at 15:30, a batch of connecting plate components in the workshop were sprayed with primer after sand washing, and the sand washing reached Sa2 ½ level.
On October 22, 2020, on a sunny day, at 15:30, a batch of connecting plate components in the workshop was sprayed with primer after sanding, which reached Sa2 1/2 level.