Homebrew PCBs

Hi guys,

OK, so a 'mil' is actually a 'thou' which is 0.001in or 
0.0254mm...sorted ;-)

If people are having problems soaking boards and them contracting have 
they tried just soaking the paper on the top?

From what I've tried, the toner seems to set quite quickly once the 
iron or other heat source is removed but the board is still hot 
(>90degC). I would guesstimate that the toner melts above 100degC so if 
the board hisses when water is applied, chances are it is still too hot 
to attempt any form of water attack.

OK, if its plastic backed why not score some slight lines though this 
layer to allow water to penetrate it?

regards, PK