PR-1428 / PR-1773, low-adhesion sealants for removable access panels and formed-in-place (FIP) gaskets

Country: · Model: PR-1428 / PR-1773

Low-adhesion sealants for removable access panels and formed-in-place (FIP) gaskets. PR-1428 works from −54 to +121 °C, and the dark red chromate-free PR-1773 also protects against corrosion and withstands peaks up to 149 °C.

PR-1428 Class A: polysulfide, MnO₂; brush, layer up to 0.64 mm (25 mil); −54…+121 °C, up to 135 °C; removable seal, protection of wires and terminals
PR-1428 Class B: non-sag paste; access panels and FIP gaskets; −54…+121 °C, up to 135 °C
PR-1773 Class A: chromium-free, anticorrosion, low adhesion, dark red, brush-on; −55…+121 °C, up to 149 °C
PR-1773 Class B: chromate-free anticorrosion panel sealant, dark red; −54…+121 °C, up to 149 °C

Request a quote All specifications

Technical specifications

PR-1428 Class A	polysulfide, MnO₂; brush, layer up to 0.64 mm (25 mil); −54…+121 °C, up to 135 °C; removable seal, protection of wires and terminals
PR-1428 Class B	non-sag paste; access panels and FIP gaskets; −54…+121 °C, up to 135 °C
PR-1773 Class A	chromium-free, anticorrosion, low adhesion, dark red, brush-on; −55…+121 °C, up to 149 °C
PR-1773 Class B	chromate-free anticorrosion panel sealant, dark red; −54…+121 °C, up to 149 °C

Specifications are taken from the manufacturer’s technical documentation. Updated 11/13/2026.

Description

Such a sealant seals panels that are opened during maintenance, protects the joint from moisture and fuel, and lets the panel be removed without damaging the surface and paint, after which it is installed again. It is also used to make FIP gaskets and to protect wires, terminals and equipment from fuel, moisture, dirt and short circuits. PR-1428 is a two-component polysulfide that cures with manganese dioxide, from −54 to +121 °C with peaks up to 135 °C. Class A is applied by brush in a layer up to 25 mil (about 0.64 mm) and forms a removable seal on typical substrates at room temperature, while Class B is a paste for panels and FIP gaskets. PR-1773 is anticorrosion, chromate-free and dark red, and besides a removable seal it serves as a barrier against corrosion of aluminum alloys and galvanic corrosion of dissimilar metals. PR-1773 Class B is a non-sag thixotropic paste for a gun or spatula from −54 to +121 °C with peaks up to 149 °C, and Class A is a flowable brush-on version from −55 to +121 °C, up to 149 °C, which after application around a fastener does not sag from vertical and overhead surfaces. The bright color makes it easier to check application and removal.

How to choose

When a removable seal is enough, take PR-1428. If a corrosion barrier is also needed, without chromate, take PR-1773. Class A is intended for brush application and Class B for access panels and FIP gaskets. For permanent sealing of tanks and seams that are not opened, there is PR-1440 in a separate item.