CMC substitute

[Louisemarion]

I want to reglaze and fire pottery that I deemed to be seconds. I fire gas reduction cone 10. I’m assuming to do this I must coat previously glazed areas with CMC. Are there any substitutes for commercial CMC Gum Arabic?  Or tricks of the trade to reglaze previously glazed pots. Thank you. 

[Mark C.]

I refire a few pots everty fire to cone 10 and never used cmc for that process. If you want more glaze on pot warm the pot and then dip or pour the glaze on a  warm pot let dry. refire .

no need for gum

[Bill Kielb]

Other trick that comes to mind for spraying. Spray even coat, gently pull the trigger 1/2 way  (air only) and gently dry what you just sprayed. Future  coats same procedure building up the thickness and drying each until it’s thickness is similar to a freshly dipped pot. Usually two to four even light coats. Dry each coat in between before applying the next.  This works well over heavily underglazed areas on bisque ware as well and ensures each layer is applied evenly. Heavy underglaze often changes the absorbency locally so drying these areas before the next coat makes applying glazes evenly a snap.  Definitely waster slabs under reglazed pots is good practice.

Spraying allows for multiple even coats and is similar to preheating. You are trying to speed up the drying process in both cases.

Edited December 16, 2023 by Bill Kielb