In certain countries getting Sodium Biflouride (such as from armor etch) is easier and it readily turns into HF. Of course you should however still obtain the r

In certain countries getting Sodium Biflouride (such as from armor etch) is easier and it readily turns into HF. Of course you should however still obtain the relevant licences, in the UK this is the EAP licence and it lasts for 6 months and is fairly straightforward as long as you've never been convicted of a crime.