HCl Activator Shelf Life

Ordering some HCl from an approved supplier. Trying to decide how much to order so I was wondering about the shelf life?

I am not sure, but it seems to last a long time.

If you buy clean 37% HCL and dilute it to 4% or whatever you want, it would be cheaper to buy on eBay.

If you do that, be sure to use caution when handling such corrosive acid. And, always add acid to water, not the reverse!