29-01-12, 05:05 PM
To stop it in its tracks drill a small hole right at the head of the crack. About 1/16 inch or 1.5mm dia should do. The idea is that it prevents the concentration of stresses at the head of the crack and stops it gradually progressing. Still put some Araldite or other glue on the underside, unless you want to go the plastic welding route.