Thanks, Hughie...that was very timely. I've just cut up a big slab of yew and was about to start using the brass powder that I bought a few months back. I'll keep your advise in mind.
Les
I have a few slabs of red gum that are prone to splitting . What I do is using epoxy glass coat I tint it with a spirit based tint usually a burgundy colour and fill the crack with this. It turns ok and blend in with most species of timber.