Need Advice On Goat Skull

Let me start by saying I know absolutely nothing about taxidermy, so any comments would be much appreciated.

I have domestic goat skull that I had degreased and whitened by a local taxidermist. The skull was originally professionally sawed in half, right down the center. The cut was very straight and all I wanted was it to be put back together.

The taxidermist used a gray epoxy putty and did not wipe away the extra, so there is a noticeable amount all over the seam. It looks like they then air brushed the whole skull with white paint that was getting powder everywhere. I hate the way it came out, so i’m trying to redo it myself.

I soaked part of the epoxy in acetone for 3 hours and it softened a little and tried to scrape it off, but is really difficult.

Does anyone know of a better way to remove the epoxy putty from the bone without damaging it? The bone also looks to have a clear coat on it. Is there a way to remove this? What is the best material to glue bone and teeth back together? The skull is still super yellow, what do I use to whiten it more?

Thank you!