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NOTE: In hot, dry climates if you put a pan of water
____ in the fuel tank near the repair area it could add the necessary humidity.
d) Make sure the water added to the air contains less than 100 parts per million of total solids and less than 10 parts per million of chlorides.
2) If warm, moist air, at a temperature of less than 120°F (48.9°C), flows over the sealant, it decreases the curing time.
3) If you increase the temperature of the tank structure, but not more than 120°F (48.9°C), it decreases the curing time.
CAUTION: MAKE SURE THE TEMPERATURE OF THE TANK SURFACE THAT
_______ YOU APPLY THE SEALANT TO IS AT A TEMPERATURE MORE THAN THE AMBIENT TEMPERATURE. IF THE RELATIVE HUMIDITY IS LARGE, CONDENSATION FORMS IF THE TEMPERATURE OF THE METAL SURFACE IS LESS THAN THE AMBIENT TEMPERATURE. THE TANK SURFACE MUST BE DRY TO APPLY THE SEALANT.
4) For BMS 5-26 Type II sealant, if you keep the humidity constant, the times, shown in Fig. 804, change as follows for each 20°F (11°C) change in temperature: a) Tack-free times are approximately one-half as long for
each 20°F (11.1°C) increase in temperature. b) Tack-free times are approximately double for each 20°F (11.1°C) decrease in temperature.
S 368-046
(6)
To apply a new fillet seal, do the steps that follow:
(a)
BMS 5-26 Type II Class B sealant is used to apply all fillet seals after a precoat of BMS 5-26 Type II Class A-2 sealant.
NOTE: Precoat is not used when you use Pro-Seal 860, B 1/6
____ sealant. A special primer is used with PR-1826 sealant. Obey the instructions from the manufacturer.
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MAINTENANCE MANUAL
SEALANT CLASS APPLICATION TIME (MINIMUM) HOURS 1 TACK-FREE TIME (MAXIMUM) HOURS 1 OUT LIFE (MINIMUM) SQUEEZE-HOURS 1 CURING TIME (MAXIMUM) HOURS 1
BMS 5-26 A - 2 2 36 DNA 72
TYPE II B - 2 2 24 6.0 48
C - 24 DNA DNA 24 68
C - 48 DNA DNA 48 336
PR-1826 4 B - 1/2 1/2 2.5 DNA 3
B - 1/4 1/4 (15 MINUTES) 1 DNA 2
PROSEAL 860 B - 1/6 1/6 (10 MINUTES) DNA 2 DNA 4
3
____DNA - DOES NOT APPLY.
NOTE: AT 77`F (25`C) AND 50% RELATIVE HUMIDITY AMBIENT CONDITIONS. OTHER TEMPERATURE AND RELATIVE HUMIDITY CONDITIONS WILL CHANGE THE TIME.
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