Apple and Tiger coral are particularly strong and resilient and react similarly to bone. They are 100% stable and will not shrink, bend or move. One tip that we recommend is after the initial shaping, seal the surface with super-glue, let dry, final sand, repeat if necessary, and polish. Because the material is porous, the super glue helps to seal the exterior and, makes the buffing process much easier as buffing compound is difficult to remove from pores. It is an extra step that is well worth the extra time.