This is an interesting question as ceramics is still changing.... I attended a Mayco Knowledge Workshop last summer where we used underglaze (true underglaze, not their Stroke & Coat) on cone 04 low-fired bisque and then immediately applied their clear glaze on top without firing first. We then fired once to cone 06. The piece came out beautiful with no crazing, shimmering, pealing, cracking, etc. Mayco has reformulated their underglazes to allow it to be applied to bisque and clear glazed over before firing. It's truly amazing in my opinion. Mayco is doing a top notch job at innovatin