I use 2 things. one is called silputty, you mix the 2 ingredients and make a mold or dam to hold the hxtal inplace till it dries and then sand and buff or apply a thin layer of hxtal again.
hxtal comes in 2 bottles mixed 1 to 3 and hardens like glass and can be sanded and polished like glass never yellows. $50 for 1 oz.
sillputty is a soft plat doe kind of stuff mix and mold, dries in 10 miniutes, links.
silputty link
http://www.vandykes.com/product/02210638/
hxtal link
http://www.hisglassworks.com/pages/hxtal.html
it took me some time to get this working right.
You did a great job! I had the same product but have not used it yet cause I was not sure what to use as a dam to hold it in place. Also did not want to mess a good piece up.
the hxtal is very thin and take days to dry hard enough to work with. the silputty is great stuff also. if you heat the hxtal for a few seconds it will harden faster, BUT you need to try it out a few times on a cheap piece. I spent 100.00 on trial and error. picture of a dam on the bottle to repair a chip,
also pictures of a 3000.00 bottle with a lip repair, the pen shows the location of the chip dead center, do not add color on small to medium chips. the color of the bottle should be taken on by the repair.