It is generally not recommended to put repainted ceramic that has already been glazed in the oven, as it can lead to various issues. Glazed ceramics are fired at high temperatures during the initial manufacturing process, and the glaze is essentially a glass-like coating that seals the ceramic surface. The glaze provides a protective layer and prevents liquids or other substances from penetrating the ceramic.
Here are some reasons why putting repainted glazed ceramics in the oven is not advisable:
Risk of Damage: The additional heat from the oven can cause the repainted surface to expand and contract, potentially leading to cracks, bubbling, or chipping of the new paint. It may also damage the existing glaze or cause it to craze (develop a network of fine cracks).
Safety Concerns: Some paints or coatings may release harmful fumes when exposed to high temperatures, posing health risks or causing unpleasant odors in the kitchen.
Uneven Heating: The oven's direct heat can result in uneven heating, leading to inconsistencies in the new paint's appearance and potentially affecting the ceramic's integrity.
If you want to repaint a ceramic item that has already been glazed, consider using non-toxic, food-safe paints specifically designed for use on ceramics. These paints are intended for decorative purposes only and should not be subjected to high temperatures or direct contact with food.
To preserve the longevity of your ceramic items and ensure safety, it's best to avoid exposing them to high temperatures or extreme conditions beyond what they were designed for during their original manufacturing process. If you wish to change the appearance of your ceramic items, consider repainting them for decorative purposes only and avoid using them for food-related functions.