
erdabyz has been experimenting with soldermask on homemade PCB’s:
I found it like a year ago, and I thought I had to give it a try. Bought a syringe and… my life has changed since then. Once you know how to use this stuff properly, your homemade PCB’s will never look the same.
Via the forum.

I’ve just bought one. I want to change my life too :D
Nice, you won’t regret it!
It takes a while to learn how to properly apply it, but once you get it right, you’ll wonder how could you live without it. Oh and don’t use your best PCB to try it the first time, you’ll likely screw the first PCB you try to soldermask.
I just got mine today, i’ll try it soon