PPG PR 1425 B 1/2 PART A PR-1425 Class B is an aircraft dash cam and canopy sealant. It has a service temperature range of -65°F (-52°C) to 250°F (121°C) with intermittent trips up to 135°C (275°F). This material is suitable for glass, polycarbonate, acrylic and other weather sealing applications. This product is specially formulated to prevent cracking of substrates. Cured sealant resists UV and weathering. PR-1425 Class B is a two part dichromate cured polysulfide compound. Uncured material, low sag, low sag, low sag. This sealant bonds elsewhere on common aircraft surfaces.