Are these suitable for spraying metallic paint? I recall back in the day when we were still using cellulose, my favourite technique for getting an even finish was to use a pressure-fed spraygun (Devilbiss of course) turned up to 90psi and spraying from at least 6' away from the surface. I always got a supremely even result by doing this. But times and paint formulations change so what's the best option currently?