Here's my reply from the dealer:
Thank you for your email.
We suggest not waxing the vehicle because the paint sealant is a thick wax itself that has been applied to the unit to provide a barrier from the environment into the paint. The wax that we applied stops sunlight from fading the paint surface. It stops acid from bird droppings and tree sap from penetrating the paint surface. When combined the Rust module and Paint Sealant give our clients the 5 year surface rust warranty which you wont get with any under body or around body oil spray.
With the First Canadian module no additional rust protection in required.
I will tell you that NOT ALL MODULES are the same. The First Canadian module that we have installed on your car works when moisture is present AND when it is not. The warranty that you have on the car is 10 years on your inside out and 5 years on your outside in. Oil spray is 0 warranty in most cases.
If you have any questions please don’t hesitate to reach out.
Always here and happy to answer any questions that you may have.
https://www.firstcanadian.ca/chemical.htm