Hello,
I have a design made out of cardboard that I will be keeping outside in the elements. I need it to be able to hold rain water inside it, so I'm wondering if there is any way to water proof it? Here are some ideas:
1) What If I painted it with an oil based paint? 2) How about using epoxy glue and covering the entire inside? 3) What about coating the inside with Portland Cement? 4) I could coat the inside with tin foil, then use epoxy on the joints?Is there a much better idea than these?
Thanks