The Pourform is $42.00 Canadian for 3/4" x 4' x 8' sheet where the Marine plywood is $111.00 per 1/2" x 4 x 8 sheet. I didn't get pricing for 3/4" Marine. I've used this stuff for years and it is Very structural and tough and ....... it will be coated with Epoxy.
I will have 5 access hatches to the bilge.
Interesting. I assume the Pourform could be used for exterior applications also. I need to rebuild a locker/helm seat in my cockpit that houses propanetanks.