Monomer : Methyl methacrylate or better (more hydrophobic) is butyl methacrylate (NB. Not tert-butyl methacrylate)
Crosslinker: Ethylene dimethacrylate (alternative silly name by Sigma Aldrich is ethylene glycol dimethacrylate).
UV sensitizer (free radical generator in UV.): DMPA or dimethoxyphenyl acetophenone.
One can use about 1 part DMPA to 100 parts monomer to 5-10 parts crosslinker.
I found that subject at wikipedia to seal holograms and I found may be it is useful to replace DCG for collotype or carbon or gravure.
http://holowiki.nss.rpi.edu/wiki/Sealing_DCG_Holograms
What do you say ?
Mustafa Umut Sarac
Istanbul