The primer is the first layer of colour that is applied on the model in order to prepare the surface for the subsequent painting processes. In order to guarantee an excellent adherence it is necessary to apply it on a previously ‘degreased' surface, therefore it is advisable to wash the model or the figure before priming it in order to remove the remains of release agents. Vallejo Primers is a range of acrylic primers specially formulated for airbrushing. Recommended compressor settings for our colours are around 15 - 20 PSI or 0.5 to 1 kg. The primers are applied in successive coats and dry quickly, forming a homogeneous film of extraordinary hardness and resistance within a few hours after application. They can be used directly or diluted with our Airbrush Thinner (B002X6DTHK) or Flow Improver (B00QD780G0). The matt black primer and white primer are available in different sizes: 18 ml (0.6 fl. oz.) bottles with dropper, and 60 ml (2.02 fl. oz.) and 200 ml (6.76 fl. oz.) bottles with hinged cap and eyedropper. Both products, the matt white primer and black primer, come in 200 ml (6.76 fl.oz.) bottles with hinged cap and eyedropper.