I have a variety of burl veneers about 1/42 in thickness that I've been trying to use in making scales.

How do I stabilize the veneer so that it doesn't crumble while working on it.

Here are my process and thoughts. After applying the veneer (I epoxy it together to the base wood scale) I use a hobby razor to cut the veneer to the shape of the scale. The edges are rough and need smoothing out. This is where the problem starts.

The veneer crumbles away and cracks when sanding. I was thinking that maybe I should first use some sort of wood filler to fill any small cracks and holes in the veneer. Then I was thinking of using wood hardener over that to bolster the veneer.

Does that sound right?

I'm open to suggestions.
Thanks