K, so it's just like an aerosol pain can, but the nozzle was weird and the stuff came out in strings and it kind of made blobs as it fell. I figured it was just like that and it would wash out. I did shake it really really well before using it too, so that's not the problem
It's called Sluyter feather spray 470. I bought it at a fabric store...
By the way, it's not really stiff, maybe just a tiny bit stiffer than the fabric that's not affected.