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Chart B:
Zahn Cup
Zahn Cup
sec (#2)
sec (#4)
16
17
18
19
20
22
24
27
30
34
37
41
10
6.2 Spray Gun Technique
Connect the appropriate air hose to the spray gun. Begin turning the material adjustment screw (#19) anti or
counterclockwise 1 – 2 full turns. Look at the size of the fluid pattern and flow volume. Adjust before applying material to
your substrate. If you have too much fluid flow, turn the material adjustment screw clockwise. If you do not have enough
fluid flow, adjust the material adjustment screw anti/counterclockwise. Hold spray gun 4" – 6" (10cm-15cm) from your work
surface depending on the size of your substrate. Closer is generally preferred for highest efficiency and the least amount
of overspray. Follow the proper spray technique as outlined in the spray technique diagram. You can increase or decrease
the fluid flow as desired as well as the distance from your work surface as necessary. Adjust the Fan Adjustment Ring as
desired.
Like any skill, practice makes perfect. Never try to rush the spray finishing process. Learn the characteristics of the coating
you will be spraying. Build up layers of material. Sand between coats and allow proper drying time between applications.
Here are some general guidelines for effective spray finishing:
1. Remember to always keep the distance between the spray gun and the surface the same when moving across
your work, (or up and down) called a "pass". Do not rotate or turn your wrist from side to side. See Chart C below.
2. Move the spray gun across your work from end to end.
3. Be sure to maintain the same speed of movement. This ensures an even application of coating.
4. At the end of a "pass" always release the trigger. To continue, spray in the opposite direction and overlap your
previous coat by 50-75%
5. When finished you should have an even wet coat on your work. If you have dry spots, you have overlapped too wide.
If you have heavy or wet spots, you have overlapped too much or moved the spray gun too slow.
Page | 8
Viscosity Cup Comparison
Ford cup
Ford cup
sec (#3)
sec (#4)
5
8
12
10
15
12
19
15
25
17
29
19
33
21
36
23
41
26
45
29
50
31
Poise P
Centi-poise
cP
0.1
10
15
0.2
20
25
0.3
30
0.4
40
0.5
50
0.6
60
0.7
70
0.8
80
0.9
90
1
100
Krebs
Say bolt
KU
SSU
60
80
100
130
150
210
30
250
33
320
35
370
37
430
38
480
40
530
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