In the past, technicians mixed filler materials by hand, which 3M says was time-consuming, led to inconsistent mixing, pinholes and wasted materials. The Dynamic Mixing Systems pneumatic, hand-held applicator gun uses a nozzle with tornado-like mixing action to provide a self-contained system that blends filler and glaze with the correct amount of crème hardener and dispenses it on demand eliminating waste, saving time and reducing pinholes.