Composite decking for securing fuel tank

[VVelez216]

Thinking about using composite decking to secure fuel tank, not sure how it will hold up though with the salty seas. I wanna put 3 braces on top where the old 2by4's were, and possibly two in front of tank and another 2 in the back. What do you guys think? Has any one use this material before for any kind of boating?