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What are Underglazes?
Originally underglazes, refer to ceramic colors used under-the-glaze, like a foundation. Now the term generally refers to a product put on greenware that is covered with a clear glaze. Underglazes can be translucent or opaque. Opaque underglazes are generally used for large solid area coverage. They are opaque and will block out other underglaze colors over which they are applied. Underglazes are occasionally used in a specific technique with no covering glaze. The translucent types are referred to as One Strokes and are usually covered with a glaze as well.
How do I use Underglaze?
For best results, Underglaze should only be applied to greenware, as it
adheres better and flows more smoothly on greenware than bisque. Be sure
the greenware is free from dust to avoid pinholes. Use a wet sponge, a
water saturated brush or a spray bottle to dampen the piece, taking care
to not over sponge or polish the surface; this will cause improper adhesion
of color to the clay. Shake and stir contents of the Underglaze jar. Choose
a soft, suitably sized oval or flat glaze brush for the area being decorated;
spots and streaks may occur when too small brush is used on larger surfaces.
Sometimes the shade and texture will vary with different thicknesses.
To apply the underglaze, load brush and apply with flowing strokes, reloading
your brush often. Be sure to brush out overlaps before they dry and allow
the sheen to disappear before applying the next coat. Applying each coat
evenly in different directions can help eliminate thin or missed areas.
Always apply the number of coats recommended on the label.
How do I fire Underglazes?
Mayco Underglazes are designed to be fired to shelf cone 04 and then clear
glazed and refired to shelf cone 06, if desired. If Underglazes are not
fired hot enough in the greenware fire, the color will be weak and less
intense, so it is important to use shelf cones for best results. Most
Mayco Underglazes work well when applied to stoneware or porcelain and
fired to cone 06. For more information, please see Mayco's High Fire Guide.
