The front of the guard must be above the waterline when moving or it will peel off no mater how well you stick it. Then down past where your boat contacts beach. Plus it cannot be stored sitting on rollers or it will deform
Fwiw... 21' cabin cruiser..fiberglass v hull.
Obviously it has a hardtop(fiberglass) so not apples to apples but out here when it gets upwards of 110 deg we stay comfortable, between the shade and the hull in the cooler water. My buddies have nicer boats but they roast in the heat
Stop and measure as much as you can now. I know the floor is out already so that's kinda too late but measure that.
I wrapped every piece of wood 100% before putting in boat and covered the underside of the deck with mat before putting it down
I had stumbled across a post on some forum talking about a wdh that allowed the surge brakes to operate correctly. Don't remember details but they do exsist
There is a formula to determine allowable persons by size and weight of boat. I don't know exactly what it is because I don't need it (21') and never plan to have that many people anyway 😁