So the drawback of this is how many moulds are you buying? making a mix up over and over again because you only have one mould will be a nightmare. you need to be able to make a good consistent mix every time and get the dye right else it will look odd. also the drying time before you can take out of the mould would be a couple of days. dont underestimate just how much sand and cement it will take too. slabs aren't actually that expensive when you work it all out
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