Water based Polyurethane Primer. This Surface Primer can be used directly or mixed with other Auxiliary products like Varnishes, Mediums, etc. It is recommended to avoid mixing Surface Primer with alcohol and/or solvents. Apply with airbrush or brush. This Surface Primer has a self-levelling matt finish of extraordinary hardness and resistance, and does not hide details. Perfect as a ground for plastic, brass, resin, etc. Surface Primer can be cleaned easily using water; for a more thorough cleaning we recommend Airbrush Cleaner