Ah...see I got the PM, but now I see the thread and a photo! I can't guarantee a complete color match, but I poured a couple new ones that should at least be really close to that, the sand and bronze is what you have there. I just need your address to send you those. I wouldn't not bother trying to repair it in any way, just replace the lower barrel with one the ones I poured for you.
Now those pics are really great to see as well. It should be obvious to many that your chisel is not sharp and/or possibly not angled well. The shavings that I see around the blank are not good and I can see gouge marks on the blank in many places. These blanks are surely the most forgivable acrylics you can ever turn. Even still..you can't get to aggressive with your tools. Turn the lathe up fast as she'll go. Sharpen your chisel..a gouge is fine, otherwise I recommend a rotondo tool, I never recommend a skew unless you have lots of practice with one. If using a gouge..a good tool in my opinion, the angle the handle down steep, like 45 or more degrees so you are just contacting in the center and the edge will be cutting into the blank like a potato peeler, make light contact and only go from left to right, with your thumb riding the tool rest at all times..your thumb is your guide and pivot point..the thumb is the most important part..just like carving wood. You should have shavings coming off that blank a mile long..to the point where they spit out a couple feet of the lathe and then get caught and lash back spinning themselves back over the top of the blank..a real nuisance and you have to keep stopping the lathe and removing all the wrapped shavings..but when that's happening, it means you are doing it right.