Will there be problems if I were to use different brands (shampoo, polish, wax etc....) What if I use both Chemical Guys and Blackfire. Using Chemical Guys wax and Blackfire Finishing.....
Most of us use products from a variety of brands together all the time, nothing at all wrong with it, generally speaking.
Now if you were to ask about mixing things around with something like say Zaino/Duragloss (same difference), THOSE you do have to be more careful with.
You will have no problems using different brands/products.
I use Meguiars Soap and then some Prima/Meguiars polishes but finish with Prima Wax.
Interior I use Meguiars and Car Brite so its no problem.
As long as you're not mixing two products together into one you will have no problem and can achieve awesome results if used properly and with correct technique.