spray powder advice needed

I need a bit advice on the choice of spray powder, most of our jobs are printed on 230-350 gsm box board. what type of spray powder should I use?... currently we are using 300/C powder.
What's the difference between coated and uncoated spray powder?

 

i believe the diffrence is that coated powders .coated with scillicone are better suited for machines with powder sprayer
to keep powder lines dry also may have abetter result on coated stocks as it will not remove the shine from inks
like some non coated powders

 

The number indicates the spray size (micron), and the letter 'C' indicates Coated. Coated sprays are best used on one sided board jobs. Expect a quick build up of spray on your blankets if you have to back up jobs. Most graphics supply companies websites will have information on the variety of sprays available.