Make sure that your paper is wet on both sides from the epoxy.

I make it like this way:
I use printing paper ,white& color paper
Make sure you have a flat onderground (wood or steel plate)
Then i lay a plastic garbage bag on that onderground than epoxy,a layerpaper,epoxy ect ect until you have the correct thickness. Make sure you spread the epoxy enough about your paper.
Then again some garbage bag plastic a upperlay of wood or steel plate or anything else you use.
Clamp for a day and you are ready to go. (sometimes is 24 u not not enough, epoxy dry the best whit 18 degree)
Good luck and have fun