Sealing Compound (MIL-S-8516). MIL-S-8516 is an accelerated, synthetic, rubber sealing compound used for sealing low-voltage electrical connectors, wiring.   and other electrical equipment against moisture and corrosion where temperatures do not exceed 200°F. This sealant has very good resistance to fuels, oils, grease, water, and humidity. However, it is NOT authorized for use in engine bays, keel areas, or areas adjacent to bleed-air ducts. It is manufactured in kit form and comes in sizes from 2.5 ounces to 1 quart. MIL-S-8516 is available in three classes with different curing times. Class Curing time in hours 1 24 2 48 3 72 Silicone Rubber Sealant (MIL-S-23586). Room temperature vulcanizing (RTV), silicone rubber sealant is used for sealing small electrical connectors and electrical components that are located in areas where the temperatures are between 200°F and 450°F. This sealant has good resistance to weathering, moisture, and withstands ozone. RTV silicone rubber sealant is available in two types, both used for the same purposes. The two types are type II, class 2, grade A, and type 1, class 1, grade B- 1. Type II, class 2, grade A contains cure volatiles and should be used only in well-ventilated areas. Adhesive Silicon Sealant (MIL-A-46146). Also known as 3145 RTV. A noncorrosive sealant for use on sensitive metals and avionics equipment in areas that are exposed to temperatures between 250°F and 350°F. This sealant comes in 3-, 8-, and 12-ounce tubes. CAUTION Many RTV silicone sealants contain an acetic acid curing agent. These sealants, when in contact with metal, cause rapid corrosion. RTV sealants that contain acetic acid are NOT authorized for use on electronic or elec- trical circuits. They may be identified by the emission of a vinegar odor while in a liquid or curing state. Q81. Complete information on the types and applications of aircraft paint systems is contained in what publication? Q82. After it is mixed, the storage life of epoxy-polyamide primer is limited to the amount that can be used in how many hours? Q83.  What is the standard, general-purpose, exterior protective coating for aircraft surfaces? Q84. What are the two classes of spray guns? Q85.  When flammable materials are used, all sources of ignition must be at least how far away from the work location? SUMMARY This chapter identifies the manuals and procedures used to detect and combat corrosion on naval aircraft and support equipment. It identifies the types and causes of corrosion. Familiarize yourself with types and uses of cleaning materials and the procedures and materials for preservation and depreservation. This is vital information. 4-54