Use Table entitled "RECOAT WINDOWS" to determine appropriate recoat windows
for each coat after the initial coat. Apply each coating during
appropriate RECOAT WINDOW.
If coating is not applied during RECOAT WINDOW, apply during EXTENDED
RECOAT WINDOW. Application of any epoxy coat within the EXTENDED RECOAT
WINDOW requires application of a TACK COAT prior to applying any full coat.
Perform CURE TEST immediately prior to application of TACK COAT to
determine condition of applied coating. If CURE TEST indicates that
surface is fully cured, provide GLOSS REMOVAL prior to application of TACK
COAT.
If coating is not applied during EXTENDED RECOAT WINDOW, or if surface
temperature exceeds 49 degrees C 120 degrees F between applications,
provide GLOSS REMOVAL, apply TACK COAT, where applicable, within 24 hours,
and apply next full coat within TACK COAT RECOAT WINDOW.
RECOAT WINDOWS
Temperature degrees F
60-70
71-80
81-90
91-100
101-110
111-120
Temperature degrees C
16-21
22-27
28-32
33-38
39-43
44-49
EPOXY OVER EPOXY
RECOAT WINDOW (Hrs.)
24-72
18-60
16-48
12-36
8-18
4-6
EXTENDED RECOAT
72-168
60-140
48-120
36-96
18-36
6-12
WINDOW (Hrs.)
TACK COAT RECOAT
6-72
4-60
4-48
3-36
2-18
1-6
WINDOW (Hrs.)
Temperature degrees F
60-70
71-80
81-90
91-100
101-110
111-120
Temperature degrees C
16-21
22-27
28-32
33-38
39-43
44-49
FLUOROPOLYURETHANE OVER EPOXY
RECOAT WINDOW
24-96
24-72
16-48
12-36
10-24
8-16
(Hrs.)
EXTENDED RECOAT
96-168
72-144
48-120
36-96
24-48
16-24
WINDOW (Hrs.)
TACK COAT RECOAT
24-96
24-72
16-48
12-36
10-24
8-16
WINDOW (Hrs.)
Temperature degrees F
60-70
71-80
81-90
91-100
101-110
111-120
Temperature degrees C
16-21
22-27
28-32
33-38
39-43
44-49
FLUOROPOLYURETHANE OVER FLUOROPOLYURETHANE
RECOAT WINDOW
8-48
6-48
4-36
3-24
2-12
1-2
(Hrs.)
EXTENDED RECOAT
NONE
WINDOW (Hrs.)
TACK COAT RECOAT
NO TACK COAT USED
WINDOW (Hrs.)
The temperature ranges shown in the table above are for determining recoat
windows. Choose recoat window based on the highest surface temperature
that was sustained for one or more hours between coats. This applies to
the entire time between coats. Measure and record air and surface
temperatures on hourly basis to determine appropriate recoat windows. If
SECTION 09970
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