Despite all efforts, extended periods of extremely hot weather can cause minor evaporation and thickening of the makeup. If you use PROAIIR Hybrid do NOT thin with ANYTHING - please contact ShowOffs for a special mixing agent which is not sold in stores. But should that occur with other brands, a couple of drops of water or rubbing alcohol should be enough to thin it out. Use water to thin water-based makeup and alcohol to thin hybrid makeup. NEVER mix the two!  We recommend that our ink be sprayed with a dual action, bottom feed airbrush with a nozzle/needle size of 0.5mm to 0.8mm.