Homebrew PCBs

I am trying to use MG chemicals dry film as a photo resist for etching metal parts but so far I have had difficulty with the emulsion not adhering well to the metal and leaving lots of holes in the mask. I am doing precision fine-line work (50 micron lines). I can not use a laminator to cure the film so I have been using a clothes iron with poor results. any recommendations for curing the film? Also, is it possible to remove the upper (outer) protective plastic layer before exposing?

Thanks very much.