I see it.
I called around and found something similar at a local art supply store. Expensive little can.... I'm going to go there in about an hour and try this one out later.
Fotomask is red but loses its colour over time. This doesn't appear to alter its efficacy in any way but it does make it harder to see where you're applying it. It should also be used with the brush cleaner fluid. Both of them stink like f**k so use good ventilation.
I found a product called "Art Mask". It's a lightly yellow tinted latex based frisket. It's little easier to see compared to rubber cement but it's still pretty hard to see unless applied very thickly. It also is very watery and hard to apply. One quality I did like is that it doesn't have the offensive and toxic fume that rubber cement has. It has some slight ammonia smell but not bad.
I got the job done well enough so I'm pretty happy. I'm becoming a known face at a local art supply store.... I'm there every weekend!