Repairing damaged corners

[s_busby_uk]

Best way to do this? I underestimated the weight of my cab when putting it on it's side to mount some castors and noticed later I'd knocked a wedge into the top-right corner. It's not massive but it would be noticeable. I've put wood filler on it but I'm guessing that's probably not going to be strong enough as it's not really a hole, more an exposed dent. Should I be looking at epoxy or something here?

[Vigo]

Bondo is the way to go.