Does anyone no where to buy latex for repairing garden moulds and how much does it cost?

I think it would have to be individually molded - if it is something that has the same design on each side - you cover it with clay to get a inverted mold - then the latex - in a liquid is pored in and out of a two sided mold to create the mold for pouring the cement or plaster to create an overt design. Boy does that seem complicated. But basically the latex is the middleman. It creates the void to made a solid piece to attach. Hope you can figure my explanation out. I'm not sure of the price of the latex - but I would start with a home improvement store - then maybe art supplies.