Posted: 21/05/2017 at 09:16
I've got a row of concrete pots that someone we knew made and sold for pocket money, she used to do parties, and also made little concrete animals. I've had the for 45 years, never had one break and we had some extremely cold winters when we lived in Kent.
I think there must be some you tube instruction, I know ebay sell the molds because I was looking into doing some.
Plasticiser would be the best to use. Good luck with your project.
i could take some pictures of mine later if you want to see them.