Can new or used bonsai pots be reglazed?

I have some Chinese pots which I bought because the price was right. I keep thinking that they could be enhanced with nicer glazes. The current glazes are not glossy, but look "painted"; the yellow and reddish brown glazing.Can already made pots, glazed or unglazed, be reglazed? Thank you for your help.
Salut, Todd

I glazed some unglazed used pots. One of them I sold this weekend in Poland.
And I put some more glaze on glazed pots too, but that was a special case - the first glazing wasn´t fired totally in some cooler parts of my wood fired kiln.