The steel structure drawing paper says: all metal iron parts are brushed with antirust paint two degrees, the exposed part of the brush and paint two degrees (paint 38), paint 38 what does it mean?

Hahaha. Aluminum and iron antirust paint, that came out of this name. It is the manufacturer's people, right, the whole each so special name.

You should first ask the designer to make sure that "Paint 38" refers to the brand or model number of the paint.

Or the film thickness, dry or wet?

Theoretically, the mixing of the topcoat brush 2, each wet film to 50 microns, dry film to 35-40 microns. The overall film thickness has to be 80-100 microns.

Steel structure anti-corrosion requirements to achieve the prescribed film thickness, in order to play the corrosion resistance years.

Industrial paint professional and technical service provider