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Beautiful Sprayable Glazing - Ask the Experts

Experts@spraygunindustry.com


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Ceramic Glazes Finishing
Ceramics are an art - Bring that quality to your finishes

Don't forget you can use a casting pot too!

There are 3 types of Glaze so the choice of Glaze will affect the tip sizes that your purchase. Generally, since you want to get a good build of about 1.5 so it is good to use a thicker glaze under pressure. Many places that sell you an HVLP spray gun might sell you with a tip size too small and you have to thin your glaze too much

Spray glazes usually have a viscosity in the 25 to 45 second range, though this will obviously vary depending on the size of the hole in the cup. These glazes are kept thin so that they are easy to spray, but if they are too thin, settling out of the glaze will occur. If this happens, either less water or more suspender should be used to increase the glaze viscosity.

Dipping glazes have somewhat higher viscosities in the 50 to 70 second range. Brushing glazes are generally very thick and will have readings in excess of 90 seconds because of their high CMC content - these have to be thinned in order to spray and you should use a pressure pot.

So your best bet is a thinner dipping glaze under a pressure feed spray gun. Or a Spray Glaze either under a pressure feed or gravity feed spray gun. We have hi-pressure pressure 1 quart pots for the thicker glazes.

For thicker glazes we recommend Reduced Pressure Spray Guns. However for Thinner glazes an HVLP will do nicely.

Recommended Tip are generlly 1.7 - 2.5mm for gravity and 1.5-2.0 for pressure

Since many objects tend to be smaller you can opt for a small tip set to gain more control.

For a dipping glaze a combination of viscosity and SG is required that will result in the correct thickness of glaze being deposited on the piece in one dip application. The usual range of SG for a dipping glaze is 1.50 to 1.70, the lower end of the range being for clear glazes and the higher end for opaque glazes. Various other factors will affect the determination of the appropriate SG of the glaze. These factors include whether the piece to be dipped is greenware or bisque, the bisque temperature, whether the piece is made from pug clay or casting slip, the moisture content of the piece, and anything else that affects the ability of the piece to absorb glaze. By comparison brushing glazes usually have SG in the range of 1.45 to 1.60.

Glaze viscosity (or thickness) can be measured in terms of the number of seconds that a given volume of glaze takes to flow through a hole of a certain diameter. The easiest way to measure viscosity is by obtaining a viscosity cup, also called a Ford # 4. The viscosity cup is a small container with an open top and a bowl shaped bottom with a small hole to allow the glaze to flow out. The cup has a handle so that it can be dipped in the glaze. Fill the cup to the brim while holding a finger over the hole. Start your stopwatch when you remove your finger from the hole. Record the time it takes until the stream of glaze breaks at the bottom of the cup and only drips remain. The number of seconds is a reliable measure of the viscosity of the glaze. Dipping glazes generally have viscosities in the 50 to 70 second range, although many of the factors mentioned previously with respect to SG may also call for viscosities outside of this range.

Recommended Tip are generlly 1.7 - 2.5mm for gravity and 1.5-2.0 for pressure / 1.5 for Mini (sprayable glaze only)

Gravity
Feed

*Top Choice MINI HVLP

MINI SPRAY GUN 1/2"-6" Fan
All Stainless Steel Fluid Passages
3 Year Warranty
Has largest Tip set of a mini gun and can be pressurized

1.0, 1.2, 1.5
Beats iwata LPH80, LPH101 and Mini Jet 4

available with a 9oz PPS Pressure System

wbmini

Basic System for Thin Glaze
Pressure for Medium Glaze
For heavy glaze see fulle size options


*Top Choice HVLP

All Stainless Steel
Smaller Foot Print Gun
Low CFM 5CFM for Glaze
WB
3 Year Warranty
1.8 & 2.0 5 Tip Sets for all Sprayable a thinner dipping glazes slightly thinned small 1 foot objects

2.0 & 2.5 larger ceramics


See also - 4 & 12 oz cups available
Keeps gun more managable
wb

*Top Choice Hi-Duty Industrial
HVLP

Hardest Tip Sets for Glaze for up to 5x longer wear than DeVilibss and Binks.
8-10CFM

cat

 


Pressure Feed

For larger projects

Low Cost Choice R Series
1.5 - 1.7

r series

*Top Choice HVLP

All Stainless Steel
Smaller Foot Print Gun
Low CFM 5CFM for Glaze

1.5 - 1.8
w/ Hi-Pressure 1 Quart Pressure Pot or smaller 9oz Pressure Cups

Xhipressure

 

*Top Choice Hi-Duty Industrial
HVLP

Hardest Tip Sets for Glaze for up to 5x longer wear than DeVilibss and Binks.
8-10CFM
1.3, 1.5, 1.7 Tip Sets

w/ Hi-Pressure 1 Quart Pressure Pot or smaller 9oz Pressure Cups

cathipressure

 

 

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