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Viscosity Chart Ford Number 4 Zahn Cup etc.

Choosing a Spray Gun w/Known Material Viscosity
Email the professor for help
professorspray@spraygunworld.com

For help selecting your pressure feed gun, please check out out SpayGunWizard
Printable charts listed below

Wizard

 

Viscosity Ratings are available from the paint manufacturer. Remember, theses are just a guideline as other factors such as curing time, build, and environment, etc., affect your finish. Due to demand we now offer viscosity cups. We choose Ford #4 cups due to the extreme costs of Zahn Cups.

Cup Type Measure
Light Consistency
Medium Consistency
Heavy Consistency
Very Heavy Consistency
Zahn #2* USES Seconds
14
14
15
15
16
17
18
19
20
22
24
26
28
30
34
37
41
49
58
66
74
82
-
-
-
-
-
Zahn #4 Seconds
-
-
-
-
-
-
-
-
-
-
-
-
10
11
13
14
16
17
18
20
21
22
24
25
26
28
29
Ford #4 Seconds
5
8
10
12
14
18
22
25
28
31
32
34
41
45
50
54
58
62
65
68
70
74
-
-
-
-
Dupont Parlin#10 Seconds
11
12
13
14
15
16
17
18
20
22
23
25
30
32
37
41
45
49
52
57
61
65
69
73
77
81
85
Lammer Seconds
10
11
12
13
14
15
16
17
18
19
20
21
25
30
32
37
41
45
49
52
57
61
65
69
73
77
81
Sear Seconds
-
-
-
-
-
19
20
21
23
24
26
27
31
34
38
40
44
-
-
-
-
-
-
-
-
-
-
   
space
space
space
space
space
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space
space space space space space space space space space space space space space
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  Suggested Tip Sets    
LC Low Viscosity (16 sec. Ford #4 and Lower)    .8-1.0 pressure or minigun / 1.0-1.3 Gravity Feed i.e. stains dyes, automotive base coats, thin woodworking
LCMC Low to Medium Viscosity (16-28 sec. Ford #4) 1.0-1.2 pressure or minigun / 1.3-1.5 Gravity Feed i.e. Automotive Clears, Plane and Boat Urethanes, thin woodworking
MC Medium Viscosity (30-40 sec. Ford #4) 1.2-1.3 Pressure or Mini Gun / 1.5-1.8 Gravity Feed i.e. wood standard lacquers and enamels, single stage old enamels
HC High Viscosity (45-54 sec. Ford #4) 1.5-1.8 Pressure Feed or MiniGun / 1.6-2.5 Gravity Feed i.e. latex paint / Industrial Coatings
VHC Very High Viscosity (55 sec. Ford #4 and Higher) 1.7-2.8 Pressure Feed / Gravity Feed 2.0-3.6 i.e. gel coat - industrial paints and primers

     SEE PRINTABLE CHART

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If you don't have a viscosity cup, don't worry almost all material can be thinned or have its curing rate changed to help you lay down a great finish. And yes, you can thin more than the manufactures suggested thin rate! After all, painting is an art, not a science. Due to demand we now offer viscosity cups. We choose Ford #4 cups due to the extreme costs of Zahn Cups. Here is a larger Viscosity Chart with Looks Like Descriptions.

Looks Like Consistency Suggested Tip Sets examples
Water, Alcohol Very Light .8 pressure / 1.0-1.2 Gravity Feed i.e. stains dyes, thin automotive base
Full bodied Sugar Water Light 1.0 / 1.2-1.3-1.4 Gravity automotive, thin woodworking
Room Temperature Pancake Syrup Medium 1.2-1.3 / 1.5-1.8 Gravity Wood Standard Lacquers and Enamels
Latex Paint Heavy 1.4-1.6 Pressure Feed or MiniGun / 1.8-2.5 Gravity Feed i.e. latex paint
Glue Very Heavy 1.7-2.8 Pressure Feed / Gravity Feed 2.0-3.6 i.e. gel coat, industrial glue

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FORD 4 Viscosity Cup

When spraying, the material you are spraying must not be too viscous for the spray gun or spray system you are using. This quality of the coating is called viscosity. Matching your viscosity with the correct tip orifice size is the key to getting a well atomized finish. If it is too thick, the finish won't atomize well or may not even come out of the spray gun. Poorly atomized coatings create a rough surface and look poor. You will have to move too slowly or too close to get coverage. When the material is properly atomized, it looks like a fin mist and leaves micro tiny droplets on the surface. These tiny droplets flow together and like magic make a smooth, level film. When you spray material at the same viscosity you get more consistency in your results. Remember also that you material gets thinner as the weather gets warmer. Too thin and you will get runs and sags. You usually like to spray between 15c and 30c.



Ford 4 Viscosity Cup
Solvent Resistant plastic with brass measuring port.
Your Cost:
FREE SHIPPING ON SPECIAL! $19.95


How to use a Ford 4 Cup

ford 4 how to use

Hang the Ford #4 viscometer cup. Allow the paint to stabilize at room temperature, or at whatever temperature you intend to measure the viscosity and spray at. Remember temperature will change the viscosity of your material. Measure the temperature for your records. Place a small container under the Ford 4 cup. Place your finger under the orifice to prevent the paint from running out of the cup. Fill the cup all the way to the top until a small amount overflows. Start a stop watch and immediately remove your finger. Allow the paint to run out into the container below. As soon as the paint stream stops flowing stop the stop watch. Record the time it took for the paint to leave the cup. The shorter the draining time, the thinner the paint.

 

Here is a Simple Viscosity chart to print

viscosity chart

viscosity cahrt

zahn viscosity

 


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