Heather says:There's a couple of ways it can be done; by sticking to the back of a glass cab and sealing, by sticking to a wooden stile & sealing with resin or by sticking to something else and putting an Epoxy sticker over the top to seal. I'm playing with the Epoxy stickers this weekend. The problem I've found with the middle option is that the inks in the papers react to the resin and go all sludgey, hence the experiments with the Epoxy stickers.
 
There are some good tutes on Jasmin Crafts,and she sells the makings too. 

I hope that helps.

Sue