Dyeing PCB

Dyeing a bare FR4 PCB plates

• Gherkin PCB top and bottom plates
• 3M 220 grit wet/dry sandpaper
• iDye Poly Purple dye
• Cheap stainless steel pot (never to be used for food)
• Boiling water 

Sanded off the green solder mask down to the bare fiberglass board. Looked like this http://www.40percent.club/2016/12/gerkin-tester.html before dying. I wet sanded to avoid fiberglass dust.

Followed the iDye Poly instructions. Only dyed for 15 minutes. Also dyed the nylon screws and spacers at the same time.

I could have sanded more in the center areas of the top plate where it is a little lighter. Having a slightly roughed up surface helps the dye penetrate.

Overall, pretty satisfied with the results.