Causes 1.Too slow-drying base coat. 2.Temperature in the spray room is too low. 3.Flash time between Base Coat and Top Coat is too short 4.Unsmooth sanding
Solutions 1.Add fast-drying solvent, such as MIBK, MEK 2.Keep the temperature of spray room at 23 - 27 °C 3.Allow 2-3 minutes 4.Sand the surface in horizontally one direction. Do not sand back and forth. The good finishing surface appearance is varied by the sanding pressure. Even and smooth sanding are necessary for the whole piece of works.