Any protector is better than no protector!
In my view its a personal preference.
But as Russ has pointed out who does go and see if the stuff has cured and is working the next day.
Its a good idea to test a drop from every 5ltrs you get on a piece of kitchen towel to see for yourselves before you
apply it.
Its a good demo for the customer to see the repellent properties on kitchen towel, doing this sells it every time for me!
And NO! Simon don't go spraying the loo roll !!!!!!!!!!!
loo roll is made to throw away silly