I did my tank exactly like David Pascoe suggested and went to Home Depo and found some semi hard plastic fence material and used it it had the correct thickness and W. What you do is fix the strips to the tank and then put Thick beads of 5200 along Both Sides of the strips which fastens the Tank to the Deck don’t use the 5200 to glue the strips to the deck. Don’t use rubber it will cause problems over time like foam will. My tank now just 5 years in but I don’t think I will ever have to look at it again. This needs to be a once in a boat life time project.
FellowShip
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My motto: Just for the Grins