# FAQ: How To Use A Viscosity Funnel For A Paint Sprayer?

## What viscosity should paint be to spray?

There is a rule of thumb in the paint industry that a viscosity of approximately 100 cps (1 P, 0.1 Pa•s) provides acceptable spraying, brushing, or roll coating. However, that viscosity is not measured under just any set of conditions or done with just any viscometer.

## What does a viscosity cup do?

A viscosity cup is an instrument used to determine a fluid’s thickness and flow resistance. This is done by introducing a sample of the fluid into a container with a hole in its bottom and recording the time it takes for the container to empty when draining the fluid through the opening.

## What do I need to know about choosing a coating viscosity cup?

To select a viscosity cup that will match the needs of your painting you can check the coating data sheets for your coatings and see if a cup is referenced. You can then consider a viscosity cup conversion chart that shows the range of viscosities a particular cup can measure.

## How is viscosity calculated?

There are several formulas and equations to calculate viscosity, the most common of which is Viscosity = (2 x (ball density – liquid density) x g x a^2) ÷ (9 x v), where g = acceleration due to gravity = 9.8 m/s^2, a = radius of ball bearing, and v = velocity of ball bearing through liquid.

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## Do I need to thin paint for sprayer?

Yes, the latex paint does need to be thinned. Even though latex paint is water-based, it is thicker than the oil-based paint varieties. The thick latex paint needs to be thinned to be able to spray a fine mist of paint. Before applying your paint, it is a good idea to test out the paint’s viscosity.

## Does paint have high viscosity?

High viscosity paint will smooth out more slowly than low viscosity paint, it will flow more slowly, and drip more slowly, and it will retain the details of a brush impression for longer. But there’s more! Paint is not made up of one ingredient.

## How much paint does a viscosity cup hold?

The viscosity cup supplied with the unit holds 1/10 of a quart. Block the hole in the viscosity cup with your finger and fill up with the required thinner. Add the thinner to the paint and stir with the paint stirrer provided, and re-measure the viscosity.

## How do I know if my spray gun is too thick?

Check the thickness by running the paint through a funnel. If it flows freely through the funnel, you know the paint is thinned enough. If the paint is too thick, add an additional ⅛ cup of water per gallon (3.8 liters) of water and mix.

## How do you thin enamel paint for a sprayer?

Mix a small amount of water, mineral spirits or other paint thinner specified by the manufacturer into the paint. Refill the spray gun and test the paint again. Continue adding thinner until the paint sprays evenly and easily out of the gun or until you reach the maximum amount of thinner the manufacturer specifies.

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## What does viscosity mean in paint?

Paint viscosity. Viscosity can be defined as the resistance of a liquid to spilling. This resistance to flowing is due to the friction between its molecules, which move at different speeds, and collide with each other making motion difficult.