There is nothing quite like Micro Weld styrene solvent cement.
You will find that application is very much different from, and easier than,
other cements. It is much more forgiving than other cements are, stronger
when dry, and will not craze clear plastic or tend to warp thin plastic parts
like other cements can. Since it will not “lift” most paints, it can be used to
repair models without repainting. No longer do parts need to be held together
while applying adhesive to the seams.

You will now have both hands free to position parts properly.