PR-1428 Class B is a low adhesive sealant. It has a service temperature range -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 250°F (135°C). The material is designed for use as an access door sealant or in the fabrication for form-in-place (FIP) gaskets. It can also be used to protect electrical wired, terminals and equipment against fuel moisture, dirt and short circuits.
PR-1428 Class B is a two-part, manganese dioxide cured, polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form a removable seal to common aircraft substrates.
After a long search for Cessna 172RG fuel tank plate sealant part number. I ordered it from Air Spruce. And the sealant has the right amount for plates. 6 oz. I dont order much like bulk. But Air Spruce is a good company to order from. Gennaro Bruno
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.