My private expertise with warmth toner switch methodology of constructing PCB. It really works ONLY with laser printer.
Goal of chemical tinning in final step is to guard copper in opposition to oxidation and supply good solderability.
Utilizing Liquid tin is elective. Tinning may be completed manually with common solder, flux and iron.
All chemical compounds utilized in PCB manufacturing must be accessible at digital interest store or may be discovered on-line.
There’s listing of product distributors at producer’s website