I have done some panels using Letraset Safmat (not any more have you seen the new prices
) and mat self adhesive inkjet film and a lot cheaper. These were printed up on paintshop and as previously stated print a plain sheet first to check positions first then print onto the paper. The big thing is that it does not need to be protected as so far I have had no loss of letters. Probably the biggest problem is with panels that are bigger than A4 (see the join on the LCR bridge) this takes a lot of care to get right, more care than i used! The meters were treated in the same way using the blank side sprayed white first.