Glazing is an important part of finishing a piece of pottery. It adds color, texture, and sheen to the piece and creates a professional and aesthetically pleasing look. But too much glazing can be disastrous. Excessive glazing can cause cracking and marring, weakening the structure of the piece and creating unsightly blemishes. Understanding how to properly glaze a piece is essential for achieving attractive and enduring results.
What are the Effects of Excess Glazing?
The effects of adding excessive glaze to pottery vary from minor flaws to total structural failure. Too much glaze causes an imbalance of moisture in the ceramics, leading to cracking and warping. This makes the piece fragile and prone to breaking easily. Excess glaze also creates uneven surfaces, making it difficult to apply other layers of glaze or paint, and it may also cause glazing material to pool in crevices and around edges resulting in an unprofessional appearance. It is important to prevent these problems by using just enough glaze.
Glaze Overload: How to Avoid it
The best way to avoid glaze overload is to start with small amounts of glaze, then gradually add more until the desired density is achieved. Working with small batches will allow you to increase the amount gradually and make it easier to apply multiple thin coats of glaze. Applying multiple thin coats will produce a more even coverage and allow you to build up the layer of glaze slowly, preventing excessive buildup in any one area.
What Glazing Materials Should be Avoided?
Certain types of glaze can be more prone to excessive buildup than others. Glazes that contain a higher proportion of suspending agents or mineral additives such as talc, bentonite, or diatomaceous earth have a tendency to thicken when too much is used. This can make it difficult to apply evenly and can cause the glaze to become clumpy or sticky. Avoiding these types of glazes and opting for those with fewer additives or low viscosity will help prevent excess glazing.
Tips for Applying Glaze Evenly
When applying glaze, it is important to use even strokes, applying the same amount of pressure and avoiding any excess build up in one area. Be sure to inspect the piece before applying a second coat to check for even coverage. Using a potters wheel can help to ensure even coverage, as it is easier to gradually build layers with a controlled spinning motion rather than manual brushing. Finally, let the glaze dry completely before adding another layer or applying a paint or glaze colorant.
Troubleshooting Common Glazing Mistakes
If the glaze has been applied too thickly, the best course of action is to scrape off the excess glaze until the desired amount has been achieved. Be sure to keep a damp cloth on hand to wipe away any residue. If this is not successful, there are various ceramic products available which can be used to break down excess glaze and smooth out any rough areas in preparation for a new coat.
Different Types of Glazes and Their Uses
There are many different types of ceramic glazes available on the market designed for various purposes. Glossy or matt glazes are often used for the decorative finishes of pieces, while high-fire glazes are better suited for productions that involve firing at high temperatures. Low fire glazes should be used for pieces which will not be fired. The type of glaze used should be appropriate for the purpose of the pottery piece.
How to Choose the Right Amount of Glaze
Choosing the right amount of glaze for a pottery project is also essential for achieving professional results. A general rule that can be applied when measuring out glaze is to use enough to be able to see the potter’s finger pulled out through the glaze when swiped against the surface. Bear in mind that more water will be added during the application process which will thin out the glaze further, so always err on the side of caution when measuring out glazes.
Safety Precautions When Working with Glazes
As with any substances and tools used in ceramics, protective clothing and equipment should be worn when applying glazes. Chemical-resistant gloves, goggles, dust masks and lab coats are all essential for reducing risk of injury when working with strong chemicals or powdered ingredients. It is also important to make sure that you have adequate ventilation in your workspace, as many glazers contain toxic ingredients and fumes.
Alternatives to Traditional Glazing Techniques
If you are looking for an alternative way to apply glaze without using brushes or potters wheel, there are other methods that you can consider. Sponge painting or stamping is one option for adding decoration to pieces without having to worry about applying too much glaze. Firing certain items like marbles can also be a great way of adding color, texture, and shine all at once.
Using too much glaze is easy if you don’t keep your technique in check, but with a little practice and the right amount of glaze, you can create beautiful, long lasting pieces with ease. Remember to use even strokes, start with small batches and apply multiple thin coats, and always use protective equipment when working with strong chemicals or dusts.
