I'm filling in a concave space in a locker to mount a battery; a previous owner had just set a battery there, and I'd left it thus far (adding a battery box, at least). But the hull is rounded enough that the battery is only supported at the ends, and I'd rather fill in the void beneath to provide a better support (and real tie-downs).
I plan to put a flat G10 board underneath the battery box, and fill the rounded space beneath with ???
Options: 1) Marine plywood soaked with epoxy - this would probably be fine, but since it's at a low spot in the hull, I'd prefer something that won't rot if it ever collects moisture (water shouldn't penetrate a top layer of epoxy, but bolts for the tie-down anchors would provide a route in). 2) I can do it all in G10 board, which won't ever rot, but is heavy and somewhat expensive. 3) G/Flex epoxy would bond Starboard, but I can't really justify buying the G/Flex when I have plenty of regular West System.
Is there some other material that would work with regular West System epoxy and save a few pounds (and isn't hugely expensive)? Note that it will only be stressed in compression, so material strength isn't a big deal.
Mostly I'm just curious - I'm not a racer, so I'd probably never actually notice a few extra few pounds of G10, but if there's another good option, I'd like to learn. After all, the purpose of winter is for learning about boats, right?
I plan to put a flat G10 board underneath the battery box, and fill the rounded space beneath with ???
Options: 1) Marine plywood soaked with epoxy - this would probably be fine, but since it's at a low spot in the hull, I'd prefer something that won't rot if it ever collects moisture (water shouldn't penetrate a top layer of epoxy, but bolts for the tie-down anchors would provide a route in). 2) I can do it all in G10 board, which won't ever rot, but is heavy and somewhat expensive. 3) G/Flex epoxy would bond Starboard, but I can't really justify buying the G/Flex when I have plenty of regular West System.
Is there some other material that would work with regular West System epoxy and save a few pounds (and isn't hugely expensive)? Note that it will only be stressed in compression, so material strength isn't a big deal.
Mostly I'm just curious - I'm not a racer, so I'd probably never actually notice a few extra few pounds of G10, but if there's another good option, I'd like to learn. After all, the purpose of winter is for learning about boats, right?