Hey, I know exactly what you're talking about.
My friends call me TheResinMan for a good reason. About a 2 months ago I got this new bong from the head shop down the street. The bowl a one piece bubbler ash catcher...also the down stem is a bit short ( it also has diffuser slits in the bottom of the downstem) and the ice catcher i think is a little too dented in, it is like someone pushed in the side of the bong with a golf ball, (I think it causes almost a straw effect that may allow little particles to be sucked up! but I'm not sure) Anyway, at first it was fine, no issues, but after the bowl resinated a little, making it harder to suck bowls through, I started getting this brown "resin" on my lip, sometimes a little on my tooth or tongue. Quite annoying, it smells like resin. I thought it was happening because the bong was dirty, so I cleaned it w/ 420 cleaner and took a nice big rip, what happened, EVEN MORE RESIN. I also noticed sometimes it is worse if I have chap stick on or something for some reason the resin just forms on the oil like substance. Anyway, It just means you're a Savage if you can produce resin and someone else can't with the same piece.
-TheResinMan