The White Natural Versatile Plastic (previously called White Strong and Flexible - WSF) material has a fine 'sandy' surface that needs to be sprayed with several coats of Auto Primer Filler or Auto Spray Putty and then rubbed back with about 1500 grit Wet and Dry paper to smooth the surface. It is up to the modeller to sand between coats or after several coats. Be careful not to sand the rivets.
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