Best product to line fiberglass tank

The problem with sealant in a fibreglass tank seems to be at the filler cap
A mate of mine successfully sealed his fastback tank only to find the fuel and maybe the vapour?
Had got between the tank and the liner at the filler cap neck
Then it had crept it's way down blistering the tank
Perversely it never leaked,I believe the liner was still intact when the tank around it got destroyed
He gave up and bought an aluminium fastback tank from RGMs
 


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