Homebrew PCBs

> Tin (Sn) is fussy, but Kepro, if my feeble old mind serves me, sells a
> yellow/white crusty chemical which "electrolessly" plates tin onto copper,

Kepro is going out of business. You can find this material labeled as
Tinnit, but a lot of people do not get good results. I have gotten good
results only after thoroughly cleaning the copper clad and then with gloves
on, scrubbing the copper while it is submersed in the solution to make it
contact fresh copper.

Thanks Peter for the MG Chemicals link. This sounds like it is worth trying.
Tinnit and the other similar solutions usually only last for a one time
plating.
-Mike