I can't get Hydrox as such down under, but I do use a similar product with H2O2 in it.
Living in the tropics we don't carry large quantities of any product that may be affected by heat.
Our H2O2 is kept in a one gallon bottle with a vented lid.
If the lid is not vented, pressure can build up and explode the bottle, then you have a problem with the H2O2 throughout your vehicle.
Even worse if someone is nearby when this happens.
Our five gallon container is kept in the cool at home and we de-cant it regularly.
As above, we also have had gelled products separate due to the heat, and some also (I believe), with age.
When you live a thousand + miles from your distributor, it can be a fine line between ordering enough product without getting too much that it goes off, or not ordering enough & you run short of product.
Excessive freight charges ensures that one must be frugal.
I don't regret my past, I just regret the times I've wasted with the wrong people.
Take me as I am, or watch me as I go.
I'll retire when I can no longer do what I love, or I no longer love what I can do.
Stop moving, start dying........