BOSS 315 has good resistance to weathering, vibration, moisture, ozone and extreme temperatures. It may be applied in sub-zero weather without loss of extrusion or physical property characteristics. Fully cured BOSS 315 can be used for extended periods at temperatures up to 400°F (204°C).BOSS 315 RTV 100% Silicone Rubber adhesive/sealant is a paste-like, rubbery solid when exposed to moisture in the air, one component material that cures to a tough.