Go ahead, grab your safety goggles, choose the right fiberglass epoxy resin, and we know you'll be able to do the entire repair yourself. Related: How to Diagnose and Repair a Rotting Wood Fence ...
fiberglass and resin, leaving a gaping hole in the board. He fastened a patch for the hole from some epoxy glue; Araldite is the brand he used, but any two-part epoxy, like JB Weld, should work.