Borax Overglaze

Borax overglaze is lead-free and is the lowest cost overglaze option available. It is a simple solution of Borax and water heated sufficiently until the borax goes into solution. However, it will not stand weathering. Exposed to outdoor conditions or moisture (like repeated washings) it will eventually lose its shiny surface . Use the Borax overglaze only on "indoor," decorative projects.

The specifications for this Borax overglaze are as follows:

Ingredients & Mixing

1. Borax can be purchased in grocery stores as 20 Mule Team Borax., don’t get the type with soap added.
   
   
2. Mix 5 parts water with 1 part Borax.
   
   
3. Heat this mixture until the Borax goes into solution, it does not need to come to a boil.
   
   

Application of Borax to Glass

1. Purchase a spraying device capable of spraying hot overglaze (approximately 110º F to 125º F)
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2. Clean the glass thoroughly before applying overglaze.
   
   
3. Cover the kiln shelf if you intend to spray your piece on the shelf.
   
   
4. Spray the hot overglaze on over the top and all four sides of the glass at a 45º angle. By spraying the sides first, the top will generally receive a satisfactory spraying in the process, depending on the size of the glass piece.
   
   
5. The correct application appears as a fine, gritty surface that is barely visible.
   
   
6. Avoid fingerprint contact with the glass once it has been sprayed.
   

Use the same precautions when spraying Borax overglaze as when you use any other overglaze.