You will like chris, he is a grade A personage of the highest order, just see his website to see for yourself.
He is even a member on here who checks to see what is said when his name wilts up.
The main problem with any chassis wax is it is not a one off treatment, it needs touch ups annually, and every few years a full blow in job again, and even then it can still fail, seen it with my own eyes.
Can remember a disco 1 that was done by said fella, that rusted through so badly it failed the mot, he did pay for the welding repairs, but only because the disco owner plastered it all over the web.
If you saw how easy/quick it is to wax the car, you could buy a compressor and wax gun and still be cheaper than one commercial treatment.