Why are there many small white particles on the surface of Gundam model after I spray matte paint?

I had the same problem the first time I sprayed it.

1 It may be wet weather.

Sprinkler irrigation can't filter water, you have to choose another one. It is time.

Maybe it was overspray.

LZ only needs to spray a thin layer, because it is colorless, you may not feel it yourself, thinking that it will pass without spraying too much.