its your knittting.. you can do what ever you want.
but do you want a lumpy stitcky seam?
even a badly sewn seam would be smoother than a glued seam
the trick to sewing knitting is the sewing needle should be parallel to the edges being sewn.
if the edge is this way| the sewing needle will move ^ this way. first under 2 strands on right edge, then move it to left and go under two strand on left edge. and always the needle is parallel to the edge.
and sew on the right side (not the inside!)
at first it will look terrible! (make about 4 or 5 stitches)
then gently pull the yarn you are sewing with snug.. slowly gently.. and YOWSA! a perfect seam!