I don't make many large hold ones. I did polish the inside of one by heating it well in the kiln, then holding it with heated tongs/tweezer things and fire polishing it in the flame. I decided for what I do it probably wasn't worth the time and effort though.
I know there is a glass coating that is quite pricey but did a good job if you do a lot of them (you have to buy a lot, doesn't come in like an ounce or three size from what I remember) I have it written down someplace if I can remember where...
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My current "hot" fantasy involves a senior discount on glass & tools!
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