TT-P-1757B
3.4.5 Surface appearance. When spray applied to glass test panels in accordance with 4.6.3, the primer coating shall not run, sag or streak, and shall dry to a hard smooth finish, free from
grit, seeds, streaks, blisters, or other surface irregularity.
3.5 Film properties.
3.5.1 Color. Immediately after application in accordance with 4.5.1, the color of the primer coating shall be a good visual match to the following, when tested in accordance with
ASTM-D1729 (see 4.6):
Color Y - Deep yellow
Color T - FED-STD-595, color number 34151.
3.5.2 Specular gloss.
3.5.2.1 Primer coating. The 60 specular gloss of the primer coating shall be less than or equal to 6, when tested as specified in 4.6.4.1.
3.5.2.2 Primer coating with topcoat. The 60 specular gloss of the topcoated primer coating shall be equal to or greater than 65, when tested in accordance with 4.6.4.2. Additionally, the dried coating surface shall be free from blisters, coarse particles, or other surface irregularities.
3.5.3 Adhesion - wet tape. The topcoated primer coating shall exhibit no loss of adhesion when tested in accordance with 4.6.5.
3.5.4 Flexibility. The primer coating shall exhibit no cracking or flaking when tested in accordance with 4.6.6.
3.5.5 Lifting. The topcoated primer coating shall exhibit no bleeding, blistering, wrinkling, lifting, or other surface irregularities, when tested in accordance with 4.6.7.
3.6 Resistance properties.
3.6.1 Hydrocarbon resistance.
3.6.1.1 Primer coating. The primer coating shall withstand immersion for 4 hours in fluid conforming to TT-S-735, type III, maintained at room temperature [25 ±3°C (77 ±5°F)], when tested in accordance with 4.6.8.1.1. 24 hours after removal from the fluid, the primer coating shall exhibit no softening, wrinkling, blistering, loss of adhesion, or other coating deficiency.
3.6.1.2 Primer coating with topcoat. The topcoated primer coating shall withstand immersion for 4 hours in hydrocarbon fluid conforming to TT-S-735, type III, maintained at room temperature [25 ±3°C (77 ±5°F)], when tested in accordance with 4.6.8.1.2. 24 hours after
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