I need to make a coating that fulfills the basic points: A)Polymer, solvent, photoinitiator and necesary additives should be transparent or near clear, not very toxic and be compatible with organic pigments.Ideal solvent could be water and polymer could be PVA (alcohol)? B)Once applied over a surface and after drying, selected areas not previously cured with UV, should be water-soluble. C)Coating should include some photoinitiator for crosslinking selected areas under UV of 300-400 nm irradiation to get non water-soluble areas. Does anybody can help me selecting a suitable crosslinker for this application? I previously choosed polymer PVA because I believe is non toxic, forms transparent films which are water soluble but I'm open to any other hint. Thanks in advanced for your help
-Francesc