I am going to drop some knowledge in here if for no other reason than to preserve it before it passes out of memory. A lot of the shit I'm about to reveal has been rendered obsolete by all the euro caps and the ability to go down to Michael's and buy a 5 pack of caps for your designer paint from Spain, Germany, Greece, Italy or China (via 'stralia). Some might help somebody down the road, but here it is.
Phantoms came on lots of stuff, Krylon fixative, testors cans, and a couple brands of crystal clear acrylic. Rusto fats came on a spray adhesive that shall remain unnamed. There are several versions of this cap with different color inserts and different sized metering slots. Their usefulness varied. The first fat caps I found came on Scotch-guard. They where the old school lumpy style, I have also found those as recently as 2 years ago on an industrial strength paint stripper. There where several that picked up the names of the products they came on: Bug & Tars (NY fat), Jiff-Foams (also fat, if I remember correctly) Spray & Wash (not that good but w/e), Niagaras (also fat). When a lot of those products switched to a male valve/female tip system we worked around it by taking clogged caps and cutting the stem out of them and sticking them in the female caps as an adapter. This actually works pretty good, and I still do it. It gives me a lot of control over the final output. If you where in a real pinch you could take the ink tube out of a standard bic ink pin and make a stem. It wasn't ideal, it only really worked on Krylon, but it in a pinch it would get you by.
This is really only the tip of the iceberg, there were a lot of niche caps that came on products that where only available in small regional markets. Prior to the Internet the graffiti was a very regionalized thing.