Tony what I have did in those cases was to save the sanding dust. I mix epoxy 5 min style and mix with DNA to a consistancy of milk. Mix in the sanding dust which makes it kinda pastey and work it into the crack. Let it dry for a couple of hours to make sure it is fully cured then finish turning or sanding depending where you are at. I have also sanded till the crack was full of sanding dust and then used CA. With a crack that big if it were me I would lean toward epoxy. I have also mixed coffee grounds or instant coffee with the epoxy and it worked rather well. Here is a picture of a cherry bowl I did with the sanding dust and epoxy cocktail as I call it. It is still holding good after turning a little over a year ago. This method has worked well for me. Hope this helps.
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