Here are some photos made this evening following board wax removal. These notes and photos are provided as encouragement to periodically remove the wax from your board to allow inspection.
Prior to wax removal, It as possible to see a circular, 2 inch (6 cm) diameter dent near tail. Wax was removed from entire board to allow thorough inspection. Of course, wax was removed in order to fill observed dent with resin. Following wax removal from entire board, it was possible to see a 1 inch (2.54 cm) near stringer (Photo 1, red line). This was a surprise because glass were previously applied over the cracked area to remedy cracking along nearly entire stringer length on board top and bottom (Photo 1, blue arrow). This older repair involved application of two layers of glass applied on top and bottom of board along stringer. However, crack at red line occurred. This crack was not visible with wax on board.
Applying pressure near crack forced water droplets to exit crack (Photo 2). Taste test indicated this was salt water.
Remedy involves drilling hole into soft, wet spot on center of crack indicated by red line (Photo 3). Application of pressure following drilled hole, forced additional salt water to exit board (Photo 4). Two additional holes were drilled; one to the right & one to the left of first hole shown in photo.
Compressed air was used to blow water and drill cutting out of holes. Board will be placed in direct sunlight tomorrow to evaporate remaining water from holes. Poly resin will be mixed and placed in holes. A thin resin layer will be spread across the surface over filled holes and covering an approximate area of 1 by 1.5 inches (2.54 x 4 cm). Poly resin containing wax will be used to facilitate sanding. Prior to resin application, board surface area will be sanded with 100 or 220 grit dry paper to facilitate resin adhesion.
Wet sanding will follow applied resin curing. Wet paper with water and dish soap will be used. First paper will be 220 grit. Second paper will be 600 grit. If resin is not smooth enough to begin with 220 grit wet paper, then dry 100 grit paper will be used to begin sanding.