Thoughts?
The base of the structures in my tank are almost done using polystyrene. Soon I'll have to coat it, paint, and seal... But I'm not sure whether I should go with mortar or grout. I'd assume mortar would be heavier which is a downside, but I was told grout chips easier, also a downside... Grout doesn't leave the gaps since it's not as thick, but at the same time most manufacturers list it as only for say 1/4 to 1/2 thick? :?:
The base of the structures in my tank are almost done using polystyrene. Soon I'll have to coat it, paint, and seal... But I'm not sure whether I should go with mortar or grout. I'd assume mortar would be heavier which is a downside, but I was told grout chips easier, also a downside... Grout doesn't leave the gaps since it's not as thick, but at the same time most manufacturers list it as only for say 1/4 to 1/2 thick? :?: