Many thanks for the replies! I bought a wax tart making kit to start me off & have been following the instructions that I got with it (apart from using the thermometer, as I have broken 3 of them to date, they were glass & very fragile!) I haven't checked that the oils were right for soy wax, but they were the same ones, that came with the kit, that I have continued to use, and the recommended weights were to 1lb of wax, 43mls (1.5oz) of f.o. I think part of the problem may have been not stirring enough, when I added the scent?