Kiln Wash

Kiln wash is also referred to as separator or shelf primer.

It usually comes in a powder that needs to be mixed with water.

You can make homemade wash , if you prefer.

Clean your shelf or mold before applying a new coat or your first coat of this mixture.

Any item that the glass will be coming in contact should be coated with wash.

This would include the shelves, molds, sides and bottom of the kiln.

You can protect your shelf by either using this mixture, fiber paper, thin shelf paper, or lava cloth.

You can also add texture to your wash.

Use an old bristled brush on your dry wash.

Make swirls, waves, or any design in your wash before slumping your glass into the mold.



You will need a dust mask, the shelf primer mixture, a glass jar with a tight fitting lid to hold the mixture, and a haik brush or sprayer to apply the wash.

Although using a sprayer is quicker and leaves a smoother finish, most people use a haik brush.

Before mixing the powder, put on your face mask for protection.

This dry powder can be hazardous when inhaled.

Read the manufacturer’s recommended mixing directions.

Most recipes call for one part wash to four or five parts water by volume.

Put the lid on the jar and shake to mix.

The mixture will be thin almost milky in consistency.

Stir the wash and allow it to settle for a few moments before applying to your shelf or mold.

Larger particles will settle to the bottom of the mixture.

Try to avoid the bottom of the mixture when dipping your brush.

kiln wash



Most individuals use a haik brush to apply the wash.

The wash can also be applied with a 4" paint roller, an airbrush or a garden sprayer.

Explore different methods and select one that will achieve nice even coatings on the shelf.

You can allow the item to dry between layers, but this is not necessary.

You will need to apply about 4 layers of coating.

If using a haik brush or roller, apply the wash in a different direction wit each application.

Coat the object until it has about a 1/16" thickness of wash.

If the dry coating should crack or peals, it means the shelf was heated to fast.

Clean and re-apply again and slow down the next time.

Once all the layers have been applied, allow the shelf or mold to dry for about a day.

The drying time can be sped up by placing the item in the kiln or an oven and heating to about 500 degrees Fahrenheit for about 20 minutes.

If drying in the kiln, slightly open the kiln door to allow the moisture to escape.

You can also use a hair dryer to dry your wash. It takes a few minutes, but can really speed up the drying time.

Once your shelf or mold is dry, you can smooth out the surface if needed.

This can be done by lightly brushing the surface with a pair of old panty hose.

This wash can be used to fire your objects several times.

If you notice that the wash has begun to chip or flake, it is time to remove the wash.

To remove old chipped kiln wash, wear a dust mask and use some sand paper.

Wipe with a damp sponge and reapply new kiln wash.


Stainless Steel Molds

The only way to apply kiln wash to a stainless steel mold is to preheat the metal first.

You can either heat up the mold in your kiln or convention oven to about 400 degrees Fahrenheit.

Wear an oven mitt to remove the mold and place it on a heat-resistant surface.

At this point, you can apply the wash just as you would to your shelf.

Since the mold is hot, the wash will dry quickly, leaving a powdery substance.

If the wash isn’t completely covered, place the mold back in the kiln or oven and reheat.

Then reapply the mix.






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