How to fix a Fracture in a Surfboard

Sand out fractured white cloth from ding and around the area to be blended.
Cut squares or lengths of cloth to suit shape of ding and allow small over hang to be blended in.
Mix up a small amount of filler resin with catalyst
Paint a dash of styrene on ding before laminating it; it makes the white fractures disappear.
Laminate patches.
When hard, sand, fill holes, sand again, finish coat or clear spray.