Can't tell you much about the Spit, but I can tell you the best glue for photoetch (PE) parts is cyanoacrylate or superglue (Zap-A-Gap and Plasti-Zap are two good brand names to look for). You can get this stuff from xtra thin to super thick (for seam filling). For PE, I personally like the thin stuff.
BTW, welcome to our forum family, jimwagg! Hope you enjoy your stay.
Gip Winecoff