A sand box can be a help when rebuilding a vase that has broken into a number of pieces. The weight and fluidity of sand makes it an ideal medium for this job.
Use a box large enough to give sufficient space in which to work. Stand the base of the vase in the box and pour dry sand, both inside and outside the base, to a point just below where the first fragment is to be glued. Make sure there are no grains of sand on the edge being glued.
Fit the first fragment in place, using a slow-drying two-part epoxy-resin glue. Allow at least twenty minutes for the glue to develop a hard outside skin, which will prevent sand sticking to it. Then pour more sand into the box – again both inside and outside the vase – to a level just below where the next piece is to be glued. Apply the glue and leave it as before to form a skin before pouring the next layer of sand into the box.
Continue the process until the vase is completely buried in the sand. Because air cannot reach the joins, allow at least a week for the glue to harden before carefully emptying out the sand and removing the vase. Clean off excess glue and sand carefully.