Mr.RETARDER MILD is an agent for retarding the drying of Mr.COLOR paints and eliminating lumps in brush-painted surfaces. In addition , it also greatly improves the evenness of the Mr.COLOR paint film and thus dramatically increase luster. 40ml. With a airbrush add approximately 20% Mr.RETARDER MILD to Mr.COLOR and mix in well. Continental USA shipping only, no expedited shipping available.