so i'm reading viktor's relay on how chemicals shouldn't be in contact with the water?

i don't think so, it'll be cured by then.

 

but say it is. you can add more wood on the surface to cover the cracks

where it is interlocked. so wooden covering.

 

or plastic plates then fuse them together. get creative.

 

point is buoyancy stands. no degradation. then any shape any size. fast build.