Step 9: Powder coat thine tiles!
Powder coating is awesome for a lot of reasons, but the trickiest part is trying to figure out how you are going to make something conduct enough electricity to deposit a thin layer of polymer/dye mix on it. For these particular tiles, here's how I solved that problem:
First, I set up a steel oven grate and attached my powder coating grounding cable directly to it. On top of the oven grate, I added a piece of waxed paper to keep powder coat from sticking to the grate itself. Finally on top of the wax paper, I placed my tiles. For those familiar with the process, I did not do any pre-treatment of the tile whatsoever - no cleaning, no degassing. I then loaded by powder gun with a copper vein powder from Columbia Coatings, and got to spraying using a 10,000V bias. The cost of 1 lb. of the powder? about $15. The amount I used for this project? Maybe 1/10th of a pound. This is the other reason why powder coat rocks - there is so little material usage, and its so cheap!
In the end, I had a beautiful even coating on top of my tiles!
I then carefully moved the tiles from the oven grate and wax paper, and baked them in a convection toaster oven at 400F for ~15 minutes (manufacturers recommended settings). Be careful not to knock any powder coat off during the moving process - at this point there isn't any force keeping the powder stuck to the surface other than some residual electrical charge!