Homebrew PCBs

I have used Chemical tinning in the past
I produced hundreds of pcbs this way
whilst working as a Technician at Coventry University
Stannous tinning salts  are expensive > £50 
here in the UK for 500g
I am now retired so £50 + on a hobby is a no no
So I seek an alternative method for tinning
the small pcbs that i make for my Radio Hobby
I have read about these tinning adapters but never acually
seen a pic of one.
at the moment I just use flux and a bit of solder wick
but seeing the correct tool for the job would be helpfull

Ron Priest