Mate, I haven't used tube glue in over 20 years.
The stuff is awful - with all the stringy bits, the "sometimes" adhesive quality...........just can't stand it.
Use any number of liquid cements on the market. Humbrol, Testors, Tamiya, Pastruct, Tenax - they all make great glues that quickly dissolve the surface contact area and actually "weld" the two bits of plastic together. Makes it much easier to fill joins and seams. I actually almost never (almost, I said) use filler - I put the two pieces together and hold them gently, apply a good amount of luquid glue (not enough to cause runs) and wait 20 seconds or so, then apply pressure. The melted plastic of the mating surface actually "oozes" out of the seam, effectively filling the depression or indentation of the seam. I end up using much less filler this way. Plus, the filler is now made of the same material as the rest of the piece. No more paint reacting with the filler, as sometimes happens with automotive type acrylics.
Or, use superglue as an adhesive. As an adhesive, it has fantastic tensile strength, but poor shear strength.
Cheers,
LeeTree