Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I also built boards in the early years. One of the spray on resists was produced by a company called Dynachem. It was a system that required a solvent developer and a dye to color it so you could see what was going on. Going by the odor of the product, it was probably the same product later sold through GC Electronics with the dye added to the resist. Bishop graphics made the the stick on pattters for the tape up artwork. They patterns were available in 1X, 2X and larger IIIRC. I had a camera lens I picked up at a surplus store and made my own setup for 2X artwork and used Kodalith sheet film for the negatives. The spray on resist gave me inconsistant results, probably more my fault than the products fault. There was also a dry transfer product that used rub-on patterns and traced. There were also dry transfer letters for labels on projects. I still have some of the G10 copper clad material from that era never used it all.