Mission Model acrylic primers are very easy to use. Thin using the MMP thinner ONLY. These primers need to be activated.  Mixing in the Mission Models thinner will instantly activate the primer. There are no tricks. The primers are acrylic and also non solvent based. Activating the primer will not turn it hot and will not damage any materials at all.

The primer must be thinned for proper performance and levelling. Mix it like you would mix paint. 20 to 30 % (2 or 3 drops thinner to 10 drops paint) You do not have to do anything different. We do not recommend spraying straight from the bottle as the primer is thick so must be thinned. Your airbrush can be rinsed with water and then give it a final spray though with MMP thinner. The Mission Models primer is dry to the touch in about 15min and dries super smooth and incredibly durable. No sanding required. 

MMP suggests shooting primer between 2-3" from the work surface in light wet coats.  Do not spray in light dry coats.