Have not tried this but it was tip to me a while ago: Purchase an
’egg’ of Silly Putty in a novelty/toy store (in the aisle next to
the Slinky) place putty in refrigerator until firm but still pliable,
make desired impression in putty, return putty to refrigerator or
freezer while you melt wax, then mold away. This will take some
experimentation, but worth a try. Margery Cooper, Jewelry and
Judaica @Margery_F_Cooper