They do. It comes from the tubes and the mouth. It would make more sense opposed to the resin coming from it's hands or anywhere else. The tail may be another that is NEVER stated
(the super-egg events), but possibly not. Yeah. We'll never know for certain. On the other hand, the resin coming out of various sides of the Alien's body WOULD be helpful to them but it would most likely not be possible to them. Unless I'm missing something here.
EDIT: I also remember seeing some older posts by some believed moderators named TopDogg, K20A2 and someone else as well as Dave, Bug-Hunt, and DeathDrop talking with someone about this. I think it was Dave who said it was secreted out of the tubes and the second-jaw/first-jaw
(the mouth).
EDIT: There are multiple reasons for what the tubes are for and I think that's one of them. The resin is also a probable use for them, too. But I'm no expert here, I'm just stating my opinions.
"To me, everyone is crazy. The ones in the Mental House just got caught."