Severalarticles in the Osprey Modelling Manuals series for such tanks as the Stug IIIand Tiger recommend a primer coat of airbrushed Floquil lacquer. The lacquer is supposed to adhere well to a variety of media (metal, plastic,resin). The recommendation is to let the lacquer primer coat curefor 2 days prior to any additional paint is applied

Update:

Did some research online and found out that Floquil no longer makes lacquers, only enamels and acrylics. This could invalidate the previous statement in the Osprey Modelling manuels.