Artist Matt Brown says, It was pretty heavily cracked and pitted, with knotholes and so on. But, I had a plan. A technique traditionally used with a color-matched epoxy to the wood, to give an ‘invisible’ repair.
Check out info on resin casting. You have a mold, mix the resin with a catalyst. Whatever is in the mold gets embedded in plastic. - This link doesn't include info, but it's a reminder to go check out more info on resin casting