I’d always thought that it was latex based with ammonia and some other stuff.
I suppose there might be something coating the darts that makes the latex solution congeal (something to lower the pH) but I suspect that they would work well with other sealents just by giving them more surface area to dry out on.
Stans is water based in so far as its a natural latex solution in water (with some other stuff to keep it stable).
I’d be interested to hear how well these hold up at higher pressures (gravel and road).
Gravel ive never had a problem with anchovies, and know people who use dynaplugs. But then I only run a max of 40psi in 35mm tyres.
On the road Stans Race has always sealed the punctures, worst was it dropped to 60psi but I got home and it sealed properly overnight.
My worry with road tyres is jamming a 5mm diameter lump in the tyre is going to make the tyre bulge. Almost like it needs a really thin option. Im tempted to try soaking some wool in rubber solution and using a large weaving needle with the end snipped off.