Hi everyone :)
I want to make 10 x 2kg concrete pots that are 100% waterproof. They will be filled with water.
I currently use a mix of:
Portland cement
Grey cement
sand
water
Acrylic gripcure
fibre
15% bonding liquid
I sealed it twice with bonding liquid after curing.
Should i seal the inside with clear paint, varnish or epoxy? Or is there an admixture that works?