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Strain Gage Accessories Coating Selection Chart Typical Laboratory Environment : 50%, or lower, relative humidity Coating : M-Coat A , or M-Coat C , or M-Coat D , or M-Coat F Field Applications Environment : Outdoor installations, shielded from rain and snow Coating : M-Coat F , or M-Coat J High Humidity, Water Splash Environment : Laboratory and field applications under damp or wet conditions, short term Coating : 3140 RTV or 3145 RTV Environment : Same as above but long term Coating : W-1 Wax or M-Coat F Water Immersion Environment : Short term, fresh or salt water Coating : Teflon Film + M-Coat B (on vinyl-insulated leadwires) + M-Coat J , or W-1 Wax Environment : Long term, fresh water Coating : As shown here; or W-1 Wax , or M-Coat F Recommended protective coating system for gage installations which must operate submerged in water for long periods of time.     Environment : Long term, salt water Coating : As shown above plus metal cap and conduit for leadwires   Environment : High-pressure water, short term Coating : As shown above or M-Coat F , or W-1 Wax Steam Environment : +212°F (+100°C), long-term installation Coating : Hermetically sealed metal cap, and conduit for leadwires Concrete Surfaces Environment : Long-term installation Coating : As shown above ; preceded by AE-10 or GA-61 to seal concrete surface Oils & Gasoline Environment : Commercial oils, to +180°F (+80°C), gasoline, kerosene Coating : M-Coat D plus two or three layers of M-Coat B ; or 3145 RTV + M-Coat B Environment : Synthethic oils, to +200°F (+95°C) Coating : Two or three layers of M-Bond 43-B ; or GA-61 High-Temperature Air Environment : To +500°F (+260°C), with good mechanical protection Coating : M-Bond GA-61 (short term); or 3145 RTV