I beg you to listen to the above people who strongly suggested to not make your own sunscreen....especially if you're going to use it on other people.
I implore you to not do it.
I know sure screen is ridiculously expensive, but every single commercial batch is stringently tested for things like particle dispersion, applications consistency, product degradation I adverse conditions, etc. Making it at home just simply doesn't properly disperse the zinc or titanium.
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Just mentioning for Aussies who read this, that sunscreen in Australia is not expensive and I wouldn't even attempt to make your own. I buy cancer council sunscreen and as someone who burns easily find that theirs works for me.