If you don't the solvent with turn the fleck to gel. If you apply a non water base primer down first, be sure to Flush gun then run water to make your equipment compatible. Prior to loading your cup use a wisp normally used for eggs our batter to slowly break fleck up so it does not clog gun. That is the preservative and it will fade too the correct color. The fleck go down wet with a blue gray haze. Gun setting are actually more important than tip size. The higher the air the smaller the fleck. Even using a 1.3 mm tip using this method you can still get a nice pattern. Keep in mind, odor is not always an indication of safety. In addition, low VOC offers other advantages, such as reduced ozone-depleting contaminants, lower odor, and simplified clean up and disposal. Cross hatch spray so the fleck does not look wind blown in one direction. Many companies, such as Hawk, are investing heavily in Research and Development to provide low VOC solutions to comply with the stringent rules. This will allow you to achieve the largest fleck with vibrant colors. I normally suggest those gun settings only just before I spray I shut air completely off, point the gun at a test area pull the trigger back, then slowly rotate the air control valve up, the gun will begin to spatter but slowly increase the air until the gun begins spraying a nice even steady pattern. If you spray above 45 PSI the Fleck will be destroyed and it will dry down to a dull gray haze. Multispec can actually be sprayed with a 1.3 but 2.0 to 2.5 with 20 % water with the fluid set 3/4 open at 10 psi and back will produce large vibrant colored flecks. We have servicing the refinishing market for 30 years and this is a question I get daily. We are ac warranty equipment repair center for just about anything that sprays.

I supply hundreds of companies and I'm in the industrial spray equipment business. I prefer distilled water as it slicks the fleck up. But I would use the 6 needle with air cap and run your pressure pot at 25psi.

The heavy bodied material is also e easier to work with if you add 15 to 20 % water. Its been a while since I sprayed Multispec. Multi spec is best shot with low air if you want large vibrant colors especially the stone accent line.

Multispec spray equipment guidelines