LaniJones1234

Hi all, I have just bisqued a vase which already has underglaze on it - so the underglaze is sealed. However, parts of the underglaze have cracked due to thick application. Is it possible to re apply a thin layer of underglaze on to the now naked parts of the clay where the underglaze has chipped off during bisque? If so, do I need to re-bisque or can I go straight into firing?