Re: reglazing

You can add some white karo syrup to some glaze. Heating usually helps,
especially if the glaze is thick enough.
Maybe you didn't heat the pot enough or your glaze was too thin
Unless this is a special pot, you're better off just making another one,
especially since you don't know what another glaze on top will do. 

Regards,
June
http://www.angelfire.com/art2/shambhalapottery/