Homebrew PCBs

Ok I am seeing the same problem with this 'working' paper as my other
papers, and now I'm on a laminator, not an iron....

My problem is when I heat the paper/toner onto the board, all looks
fine, as the board cools, the paper 'bubbles' up in some areas.

This is more noticeable on larger (say 6*5inch) boards than smaller,
say 3*3, on the smaller sizes, the paper sometimes just 'pops' or
lifts off.

Am I the only one suffering this?

It cant be too much heat, the new laminator is so 'warm' its not
melting the toner properly, but I still see the expansion.

I'm on a thick (1.6mm?) fibreglass board

I thought it was my water was too cold and was a 'shock' to the board,
but just letting it air-cool is causing it also.

-- 

Lez