Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
tried it, it won't hold up on a auto for more than 50 prints, it's a softer emulsion by nature, we even tried the Chromaline CP Tex supposedly made for discharge, it's pretty aweful too. So far for us Ulano 925 wr, if prepped right works good, Xenon Nova with Diazo is like steel, no hardener needed, or post exposing with the Nova, and we are now using Murikami Aquasol HVP with Diazo and it's got a really nice price point per gal, coats really really nice, holds up awesome on press for discharge or plasitsol printing, and exposes really fast for a Diazo emulsion. Chromoma blue was our favorite for plastisol, but we have been testing to get use into 1 emulsion shop wide, we are pretty sure the Murikami is the winner!
I hear ya Integrity, my friend Patrick Lashbrook that did all the production at Real Thread, all waterbased and discharge turned me on to the HVP. They do multi color discharge jobs, AOP discharge, huge runs using the HVP so for me they did the testing to see how it would hold up with w/b printing on their challenger 3. Actually the HVP without diazo will hold up for small wb orders like 25-50 pieces, maybe longer on a manual press, but on the auto they need to be hard, adding the diazo with only putting water in the diazo bottle 1/4 of the way up keeps the thickness of the emulsion and I can say it's rock hard and long lasting on press. Now that we have the I-Image CTS in action the exposure times are cut way down so it's very tolerable time wise in that aspect, but running the gambit of emulsions for discharge printing, my top two would be the HVP with diazo and the Xenon Nova with diazo. Thing with the HVP you can get it for about 50 bucks a gallon vs 88 for nova.
what do you block out with if not post exposing?Hvp is the only emulsion in my shop. Have diazo on hand but have never needed it. Everything J said above is correct in my experience- thorough exposure + hardener as needed.