Bolster backing material - " whaler board "

[abl1111]

Was in Lowes today and saw a similar brand to Azek - but not Azek. My initial view of it is:

- 12' x 12" x 3/4" estimate thickness ) @ $95

- Very heavy stuff - too heavy maybe.

- I might need (2) boards of it - maybe (3) ( Tsunami and Sceptre up front have a wide bolster area to cover and I have an i/o, so the aft too ) - so it ain't cheap.

A sheet of 1/2" Starboard 4'x8', or the real Azek stuff might be cheaper and lighter ?

Or, that Whaler Board stuff might be good too ?