- It is suitable to spray paint on door. The top and bottom surface and the 4 sides can be painted in 1 time. This machine can be used with other spraying equipment(spraying booth,spraying room,water spraying booth etc.)It can lead you a high quality production with low cost. - SPD2500D add air pressure and exhaust system on the basis of SPD2500C. The system can be dry type or water type.