I think that someone else posted their response from Toyota but here's what I got:
"""
Thank you for your recent correspondence and congratulations on your new 2024 Toyota RAV4 Prime.
We would like to take this opportunity to advise that some of our franchised Toyota dealerships may offer rust protection because the consumer demand for this product is high. Although this aftermarket product may be beneficial, Toyota Canada Inc. does not endorse the use, as we do not supply this product or oversee its manufacture or application. Please note that aftermarket rust protection products applied are entirely at your discretion.
With that in mind should any alteration or modification cause damage to any factory component of the vehicle or have an adverse effect on the vehicle performance or durability, Toyota Canada will assume no responsibility for the repairs required or any associated costs.
We would like to explain that each Toyota vehicle goes through an extensive rust inhibitor process. The body is fully dipped in a phosphate bath to make sure that even the most inaccessible areas resist rust. Next, a special wax sealer is applied to the corners and crevices of the hood, doors and trunk lid to help protect rust-prone areas. Finally, anti-chip paint is applied to the front edge of the hood, lower door panels and rocker panels to help protect these areas from stone chips and other minor road debris. The doors are also protected by lower door moldings.
Additionally, application of aftermarket rustproofing such as an undercoating product on hybrid models could affect the high voltage leads. As such, the application of the product could camouflage the orange high voltage leads resulting in emergency, dealership or independent facilities personnel being electrocuted or shocked if they unknowingly touch the high voltage lead.
Thank you for taking the time to contact us and allowing us the opportunity to comment.
Sincerely,
Haley Dupuis
Customer Assistance Centre
Toyota Canada Inc.
"""