Thoughts on rustproofing a new car

I'd have thought that all new cars would be under sealed before handover.

I'd definitely get it done though. Can the dealer not do it for you though.

New Toyotas are notorious for rust problems, especially the commercial range of vans and jeeps, I know of a 181 that has failed on rust issues on the chassis and not near the coast. Toyota must be buying their steel from an Indian del boy the way the rust attacks it

There are many variables involved. Your car will be subjected to salty moist air near the sea but OTOH a car located well inland will be in an area that is prone to frost that will result in the county council salting/ gritting the road.

If I was in this position and trying to decide I would think more about the rust issues that plagued my other cars and are those makes/models known for rust. E.g. certain Ford, Mazda, Nissan and Mercedes models are known for rust, regardless of where they are used. Also look and ask around the local area, do cars in general suffer with rust, are owners having to get them welded to pass the NCT at <10 years old.

Toyota has a decent reputation for rust protection but we can't predict the future. Hiluxes with a different type of construction are not really relevant to the Yaris.

There is marketing/fear associated with aftermarket rust treatment products, a lot of this emanates from the US (e.g the hype about POR-15)

i'd question how much benefit a one off treatment when the car is new will make after a few years. And whatever about Lanolin I wouldn't be using Waxoyl. It'll dry out and crack and could let salt and water under itself.

All things considered I'd probably skip the aftermarket and rely on the Toyota factory treatment.

The Yaris GR is prone to rust, poorly protected metal. Whether the standard Yaris is the same, I don’t know.

Around 20 years ago yeah, not so much anymore. Some modern commercial vehicles are bad for it tho

I'd jack it up and apply Lanoguard or another lanolin-based protector while the underbody is new and clean.

Pros:

Easy to apply.

Stays relatively soft so it kinda "self-heals" if nicked.

Doesn't need a pile of pre-application prep.

Doesn't dry up and let water lodge behind it.

Cons:

Needs to be done every 12-18 months.

Doesn't kill off current rust.

You can buy it as a kit with its own sprayer which has a very long straw/hose so you can keep the tub of it away from you and you spray at all angles. You don't need a compressor.

There's also a grease in that same kit which you can heat and brush on to areas which you reckon might be very vulnerable.

It's nearly a year since I've coated the underside of my camper and, from a cursory look, it's held on. I haven't been able to check if it has stopped rust in its tracks but initial signs are good.

Open to correction but I'd be surprised if any additional underbody treatment you carried out wouldn't void your existing rust warranty.

https://www.pristine-classics.com/

Your home county ..

I'd say it's also because places win a contract that replaced a older supplier. Then take short cuts.