1. Fine Screen. Although, as soon as you add heat it changes
2. Put on top of herbs
3. Press before use.
IMO The only real problem with having too pure is the wasting it as it burns or it's melting and running down into the pipe.
The cost of multiple screens can be reduced significantly by making your own frames out of scrap hardwood using a simple table saw and rolling in your own silk matt as the sieve.
Ours are stackable, and will work with either metal or poly screen, because it has both a spline chanel and a screwed retainer.
Here is Skunk Pharm Research's sources for stainless and monofilament screens, taken from their page on DIY dry sifting frames:
Sources:
A good source for stainless mesh in larger sizes and quantities is:
http://www.howardwire.com/stainless_steel_cloth.html
A good source for a polyester monofilament silkscreen is:
http://www.silkscreeningsupplies.com/silk-screen-printing-mesh
A spline roller and spline can also be picked up at the above source, or use 1/8″ window screen spline and roller from your local hardware store.
Hi Mriko......by the way, do you re-work your plant material a second time by sifting in the same way or do you cook or do other things with it?
..and yes, you can re-sieve with just the one mesh screen (for example with a 125 ~ 160 micron mesh). When you have sifted your material, remove the plant material that is sitting on the mesh, then re-tap the frame upside down to make sure as much of the contaminant as possible is removed from the screen.
It's a good idea to place a sheet of paper under the screen when sifting and re-sifting, so the resin can be easily picked up and poured over the cleaned mesh screen again. Pick up the sheet of paper, half it without folding it, and "pour" it on the screen, also give the outside of the paper a few sharp flicks with your finger while the paper is folded which will help remove all of the resin.