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Additionally why don’t you get an inside container non porous then Create mold for concrete outer. 
There are also concrete sealers sold at hardware stores for countertops. They def work.

There are various silicone sealers. You would have to do your r and d regard8ng if they can be exposed to heat and or there is chemical interaction with wax and fragrance oils, you don’t need to kill humans 

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59 minutes ago, NightLight said:

Why don’t you try melting high melt point wax and coating inside use carnauba wax

I shall, unfortunately due to covid (and/or Brexit...) I cannot get soy wax for love nor money at present in the UK.  I'm assuming from other previous responses that may not be the total solution....? 

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