TM 5-5420-278-24&P0076 000076 00-3PAINTING INSTRUCTIONS (Contd)SURFACE TREATMENT WITH METAL SEPARATING AGENTa. Preparation of Mixing Components.NOTE To ensure proper bonding, joint flanks or bonded surfaces must bedry, clean, free of dust and grease. 1.Clean per aluminum cleaning specification E 02 005 0803.CAUTIONAn excess dosing of hardener (max 10:1 by volume) does not causea deterioration of the material properties. However, under-dosingof the hardener will cause a deterioration of the hardener andmust be avoided in every case. A deterioration of the hardenermay cause damage to equipment. When preparing mixture withautomatic mixer, ensure correct setting of the dosing cylinders.2.Mix components in proportion of 10:1 by volume. Use two-component mixture within approximately30 minutes (pot time at 75°F (23°C)).CAUTIONTo avoid metal separating agent failure, do not process GD 677under 50°F (10°C).NOTE Pot time is shorter at higher temperatures. As a general rule, cuttime in approximately half for every increase of ten degreescelsius:30 min pot time at 68°F (20°C).15 min pot time at 86°F (30°C).8 min pot time at 104°F (40°C).3.Mix only the quantity to be processed in this time.b. Application of Components.1.Coat all individual parts with separating agent on the sealing surfaces. Apply a 0.04 in (1 mm)thick layer with a toothed plastic spatula.2.Assemble steel parts with prescribed torques. Separating agent must exude from all sides. Removeexcess material.c. Hardening.The hardening speed and the bonding structure of GD 677 essentially depend on the storagetemperature of the parts manufactured with it. At 50°F (10°C), the hardening times are doubled totripled, and they are shortened by about half at 86°F (30°C). A non-tacky surface is achieved afterapproximately 5 hours at 75°F (23°C).Hardening development at 75°F (23°C) on basis of the increase of Shore A Hardness:Time (H) 234561224Shore A (+/-4) 5142025283440
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