Can glazed ceramic products be re-glazed?
Ceramic Design Sep 13, 2023
Sometimes you cannot achieve the result you want in glaze firing; The color may be too pale, the desired effect may not have been achieved, or there may be a glaze error. In this case, it is possible to glaze ceramics twice or even more.
Reglazing can be done to correct problems in the glaze as well as to add color and texture to ceramic works. Fired ceramic products can be glazed several times to add texture and effect, and multiple firings are possible.
However, multiple firings have some disadvantages. After the ceramic body passes through the oven many times (including biscuit firing), it begins to weaken and become brittle. Re-firing can be a problem for both the clay and the glaze. Mud bodies may change color and darken. Glazes may swell and deteriorate. Even a non-flowable glaze can leak and damage your oven rack if you don’t take precautions. In the first glaze firing, glass was formed by melting and combining the materials that make up the glaze. In re-firing, this glass will completely melt at a much lower temperature than in the first firing and cover the product surface. The new situation that will arise may give unexpected results.
The reason you want to glaze and fire your ceramic product a second time is to add effect; You may want to give a new look to a product that looks dull and boring. To do this, simply coat your glazed piece with another glaze of a different color. You can use several shades of the same color or a completely different color. When you reglaze to add a new color or effect, you can fire it at a lower temperature than before.
If you don’t want to add effects and textures, but just want to retouch the wrong spots, you want to make the corrections invisible. To do this, glaze it with the glaze you used before and bake it at the same temperature, do not reduce the temperature. The old glaze will also melt and merge with the new layer.
Often you can make a new product in less time than it would take to re-glaze and with much more predictable results. But sometimes there may be a product you love that doesn’t turn out the way you wanted it to and you really want to re-glaze it. In this case, there are a few methods you can try.
PREPARING GLAZED CERAMIC PRODUCTS FOR REGLAZING
Sanding – You can sand a glazed piece and reduce the smoothness of the surface. Always wear a dust mask when sanding.
Heating – Heat your piece with a heat gun, in the microwave for 30 seconds, or in the oven for a while, then apply your glaze. After applying the glaze, you can leave it to dry or let it dry immediately with a heat gun.
Glue – Apply an adhesive, such as white glue, onto the product with a brush. Let it dry and apply your glaze.
Starch – Spray the starch on it, wait for it to dry and glaze it.
Hair spray – Apply a coat of hairspray, let it dry, and apply your glaze.
Do not apply too much hairspray, glue or starch. Instead of ensuring that the new glaze adheres to the glazed surface, they can do the opposite and prevent the glaze from adhering to the ceramic product.
POINTS TO BE CONSIDERED DURING REGLAZING
Application with brush – Depending on how many layers you need on your glazed piece, you can apply 1 to 3 coats of glaze and let the previous one dry before applying each coat. While preparing the glaze glaze binding additive Adding it may help ensure that the glaze adheres to the surface.
Immersion – Glazes used for dipping are thinner, so you may need to dip several times for good color and coverage. You can also remove some of the water before mixing to make the glaze thicker, as the baked piece is no longer porous and cannot be absorbed into the surface as biscuit products do. When you’re done, return the water to your glaze.
Spraying – The glazes used in spraying are also thin and apply like a mist, so you may need to do at least 3 coats.
Whichever method you choose, wait for the underlying layer to dry before applying a new layer. Remember that it will take much longer for the glaze to dry on glazed products.