The "official" response from www.scaasis.com:
Glue the pieces together with school glue, and tape each piece into
place while it dries. Continue this process until the statue is
rebuilt. Allow it to dry overnight, so that the glue sets completely.
Remove the tape from the statue. Pull the pieces of tape off
carefully, so you don't break the glue loose. If the areas of repair
are smoothly bonded, lightly sandpaper the cracks, and touch up the
paint. Mix any colors, and test the colors on a scrap piece of white
paper before painting on the statue.
Check the statue for cracks, gouges or places that need filling. Tear
small pieces of tissue paper about 1/2 inch wide, crumble them up and
squish them into the cracks. Squirt some glue into the tissue paper
and continue smoothing until the surface is smooth.
Let the tissue and glue dry in the cracks. When it dries, it may
shrink into the crack. If it does, fill it with more tissue paper and
glue. Keep repeating this procedure until you fill all cracks, gouges
and lines. This process may take several days to complete, especially
if the statue was broken into a lot of pieces.
Sand any rough edges left from your repair. Be careful when you sand,
so as not to pull the tissue and glue out of the cracks. Refill any
cracks that you accidentally mess up.
Fill in the repaired areas with acrylic paint. Test the paint on a
scrap piece of paper before you paint on the sculpture. Paint the
damaged areas, and allow them to dry.
Read more: How to Repair a Polyresin Statue With Glue | eHow.com