Opaque Ceramic Glaze Guide

Use this guide when you want opaque, continuous ceramic color on an air cure Eco Forma form. Opaque Ceramic Glaze is a tintable glaze base that cures without firing and is intended for use with compatible pigment stains, ceramic oxides, and selected effect pigments.

Opaque Ceramic Glaze is applied to the surface. It is not mixed into the wet clay body.

Ways to Color Eco Forma

For color throughout the form, choose ready mixed Eco Forma color clay.

For opaque ceramic surface color, tint Opaque Ceramic Glaze with a compatible pigment stain or ceramic oxide, then dip, pour, or brush it onto the fully dry, prepared form.

For painted color, use traditional artist media over the fully dry Glaze surface, which provides a receptive ground similar to gesso.

For specialty effects, test compatible effect pigments for shimmer, glow, speckle, veiling, or other nonopaque effects.

For transparent or translucent color, build the color within a clear or lightly tinted gloss or matte acrylic coating.

What Opaque Ceramic Glaze Does

Opaque Ceramic Glaze carries finely divided ceramic colorants across a fully dry, properly prepared form. Pigment stains and compatible ceramic oxides are the primary choices when dense, opaque color is the goal.

Once dry, the Glaze creates a receptive surface that can support painting, drawing, transfer, and mixed media. This allows color and image to continue developing as part of the Eco Forma surface rather than sitting apart from the form.

The general process is:

Form → dry completely → complete the required Dip and preparation steps → tint the Opaque Ceramic Glaze → dip, pour, or brush it onto the form → dry fully → add compatible painting, drawing, transfer, or other surface work as desired → apply Ceramic Coat at the appropriate sealing stage → apply the selected final coating → cure

The exact placement of painted or transferred media may vary with the intended effect. Some media may be applied directly to the fully dry Glaze ground before Ceramic Coat. Other compatible surface work may be added after a Ceramic Coat layer has dried. Test the complete intended layer process before using it on an important piece.

Choose the Colorant by Effect

Pigment Stains

Choose a compatible pigment stain when you want repeatable, dense ceramic color. Record the manufacturer, stain number or color identification, lot number when available, and the exact weight used.

Color developed in an air cure Glaze that requires no firing may differ from the same stain used in a fired ceramic glaze or clay body. Evaluate the completed Eco Forma sample rather than relying on a kiln fired reference tile.

Ceramic Oxides

Compatible ceramic oxides can also create opaque or strongly colored surfaces. Oxides differ in color strength, undertone, particle size, density, and behavior.

Do not substitute one oxide for another by equal volume and expect the same result. Work by weight, make a controlled test, and judge the finished Eco Forma surface.

Other Compatible Pigments

Effect pigments may be tested for shimmer, glow, speckle, veiling, or related specialty effects. They are not the default route to reliable opacity.

Keep a finished physical sample and a written record for every approved pigment and Glaze combination.

Prepare the Form

Allow the Eco Forma form to dry completely. Complete the current strengthening and surface preparation steps required for the project.

Remove loose dust and confirm that the surface is clean, stable, and ready to receive the Glaze. Resolve cracks, weak edges, pooled Dip, retained moisture, and other surface problems before applying color.

Prepare a labeled test piece using the same clay, Dip preparation, and intended layer process as the finished work.

Make a Controlled Test Batch

Work by weight rather than by spoonful, scoop, or visual estimate. Record:

• The weight of the Opaque Ceramic Glaze
• The weight and identity of the colorant
• The clay color and preparation process
• The application method
• The number of applications
• The drying and coating process

Until an Eco Forma loading range has been approved for a specific colorant, begin with a small test batch rather than a production batch.

Mix thoroughly and inspect the mixture for dry pockets, concentrated streaks, grit, or hard particles. If screening or another dispersion step is specified in the current product instructions, complete it before application.

Do not add water, acrylic medium, surfactant, or another modifier unless current Eco Forma instructions specifically permit it.

Apply the Glaze

Opaque Ceramic Glaze may be dipped, poured, or brushed according to the form and the intended surface.

Apply controlled, even coverage. Allow excess material to drain or level, and prevent heavy accumulation in recesses, holes, seams, rims, feet, and along the lowest edge.

When additional opacity is needed, multiple controlled applications are generally preferable to one uncontrolled heavy coat. Heavy buildup can obscure detail, create ridges, dry unevenly, or affect later layers.

Allow the Glaze to dry fully between applications and before continuing. Follow the current product instructions for drying time, environmental conditions, application limits, and recoat timing as those specifications are finalized.

Paint the Dry Surface Like a Gesso Ground

Once fully dry, the Opaque Ceramic Glaze surface can receive traditional painting, drawing, transfer, and mixed media methods.

Use each artist material according to its normal handling, drying, and curing requirements. Acrylic paint and acrylic ink belong on the dry prepared surface. They should not be mixed into the wet Eco Forma clay body unless a separate Eco Forma instruction specifically approves that use.

Build paint and image through controlled layers rather than one heavy application. Preserve the form, texture, and surface detail beneath the media.

When using slower curing materials such as oil paint, allow adequate curing before applying a later waterborne coating. A layer that feels dry at the surface may not yet be ready to overcoat.

Create Transparent Effects in the Coating Layers

Opaque Ceramic Glaze creates opaque color.

For a transparent painter’s glaze effect, use a clear or lightly tinted compatible gloss or matte acrylic coating over fully dry surface work. Keep the tint load low enough to preserve transparency and test the entire layer process.

A transparent coating may deepen darks, increase saturation, reveal texture, and make underlying brushwork or surface transitions more visible. Evaluate these changes on a completed sample before applying the process to finished work.

Evaluate the Complete Sample

Judge the sample only after every intended layer has dried or cured. Evaluate:

• Opacity and color evenness
• Brush, pour, or dip marks
• Settling, streaking, speckling, or particle drag
• Coverage in recesses, along edges, and around holes
• Adhesion at folds, edges, seams, and high contact areas
• The difference between the dry Glaze color and the final coated color
• Compatibility with painting, drawing, transfer, and mixed media
• The effect of Ceramic Coat and the selected final finish
• Flex, scratch, moisture, and handling performance appropriate to the project

Keep the physical sample with its written color formula, layer process, and application record.

A successful color is a complete surface system, not simply a pigment and Glaze mixture.

Safety

Avoid breathing dry pigment or oxide dust. Use appropriate ventilation, dust control, gloves, eye protection, and a properly selected respirator when the colorant’s safety information calls for it.

Follow the colorant manufacturer’s label and current safety data. Keep dry colorants and contaminated residue away from food areas, children, and pets.

Do not assume that a ceramic colorant or completed Eco Forma surface is food safe, dishwasher safe, heat safe, waterproof, or suitable for prolonged water contact unless that complete use has been specifically tested and approved.