It's been a little while since my last update . I have finished the filling (I hope) , shaping (I did some rounding) and gave it two coats of epoxy.
Apologies for the dim lighting.The first coat of epoxy has a timber preservative in it which also thins the epoxy so there is some penetration of the timber. The second coat went wet on tacky for a better bond. It was coated about a week ago. I'll give it another week ans then I will sand it smooth. Almost all of the second coat except anything it filled will be sanded off in the process and a large chunk of the first coat so it should be stable and smooth after sanding. Before the epoxy I could feel the joints of the maple. I would sand smooth, but the next day I could feel the joints again. The epoxy sealing should stop that. Hopefully in a weeks time I can start spraying primer and get an idea if there is any more filling to do.