Sealant for fuel tank cover

[FAS]

3m 5200 is listed as permanent adhesive sealant,4200 is more forgiving and is removable.both are gonna be tough to remove.8 ft of 5200 down each side is gonna give you a problem to remove.lotsa stuff out there.. polyseamseal? I will use a white pure silicone on mine,just to be able to raise the deck if needed.