strength for thinner layers on foam core
a bit of a broad question; inviting speculation or experience.
Without having a finished piece around, and in use, for a while, I'm wondering what to expect in the way of durability for some planters that I'm making.
Does anyone have an opinion on thickness, or limiting factors, for applying 'hypertufa' mixes to a styrofoam core where the intended use is as a planter?
I'm hoping to get away with about a 2cm thickness, beefed up at any sharp angles. These containers aren't huge; let's say 44cm by 22cm (18in x 9in). I read davidcdn mentioning a two layer approach, the first layer being something more substantial. I'm adding a bit of carpenter's glue as admix, and I just picked up some fibreglass drywall tape. There's a layer of freshly applied carpenter's glue before the mix goes onto the foam.
Time will tell, but are there any thoughts on this? I'm quite attracted to the idea of benefitting from the light weight as well as the form of the foam core.
Sean : s_d