Next Gen TopCoats respond extremely well to DipCoat Protective Spray, which is highly recommended for every vehicle sprayed with this coating.
Next Gen TopCoats are designed to be sprayed through turbine systems such as the DYC DipSprayer or Advanced DipSprayer, however they can be sprayed out of a proper HVLP gun as well. 1.8-2.0 sized tips at 16-20psi would be a good starting point, and you can adjust per your personal set up from there.
Test all applications in a small inconspicuous area to make sure it will meet your expectations and is suitable for each unique surface. Although Plasti Dip has proven to be safe and predictable, every surface is unique and it's impossible to predict how each surface will react.