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You didn't bother with an aftermarket treatment did you? In which case the crinkle finish is the factory under seal which is I believe not a wax based product but some kind of proprietary polymer base and is relatively durable compared to waxes. Dreadnaught has 95 plus percent left after 9 years but I don't jet the under side very often and it is also annually waxed. What I'm saying is it shouldn't be compromised at less than a year old even with repeated washing.
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
Hi Andy,
Jet washing every week? Perhaps a bit of wash 'n' wax and the garden hose now and again. There used to be an argument for not keeping a car too clean. A bit of waxy stuff left on top and road film ( a mixture of road tar, diesel and tyre rubber) underneath is no bad thing. If you live in a high salt aera forget all this.
Chris
I would second that. You can wash too often and then the effectiveness is questionable unless you have it up on high ramps and can get to every nook and cranny with the hose pipe and even then there are still plenty of muck traps that are virtually impossible to get really clean.
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
The factory anti stone chip coating (which has a textured finish) is some kind of synthetic rubber-like polymer which is quite durable and resillient against abrasion and chemicals. That coating can not be removed with power washing and detergents, unless you blast it continuously from point blank range with a power jet washer.
I power wash the underside of my car quite often and even more often during winter because of the road salt.
I have spent a lot of time this year to determine which type of underbody coating has the least weaknesses, and have not yet come to a definite conclusion. I have however conclusively determined that all bitumen or tar based coatings are a big NO for multiple reasons, and that waxes are great except for the before mentioned weaknesses.
For the time being, I coated the less exposed areas of the underbody (where there is only a small chance of those areas being sprayed or abraded directly with anything) with an underbody wax (not a cavity wax), which is thicker and more resistant to being washed off than a cavity wax (but has a lot worse creep characteristics). I have yet to determine with what to treat the exposed ("impact") areas.
Super hard polyurethane bed liner coatings like Upol Raptor are becoming increasingly popular for underbody protection, but I am not yet convinced. First, they are quite expensive, and second, they are very hard and relatively brittle (compared to other types of underbody coatings), which could cause them to crack upon stone impacts.
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