GR Yaris (Gen 2) prospective GR Yaris owner here - in need of feedback

Yeah that makes a lot of sense, do understand why you’d be concerned but there’s a strong way to fix it with the products mentioned. Mine is Dinitrol and I took it somewhere to get done. I’m not amazing at the practical stuff and they took all liners and covers off etc to ensure proper coverage. Dinitrol in the UK have an approved register of application places, not sure if same in Germany. Lots of people on here have Bilt Hamber and it’s also good stuff, think lots of garages will apply if you don’t want to / remove covers etc, which is very understandable !
But if this work is to be done properly, you ll have to remove covers - because this is were rust could start and progress without noticing...

In the meantime, my Toyota dealer told me they use the following product: https://shop.makra.de/makrakundenportal/MemberPages/ProduktDetail.aspx?group=002&ID=301-501
(anyone heard of this brand?)

However this is water-based. I m taking a guess for environmental reasons (no other country in EU cares more about the env than Germany)
Being a water-based solution, I m not sure how effective that is compared to the more tested (wax based) Dynax/Dinitrol products

Here's the translation from the description:

"Water-based underbody protection

Environmentally friendly water-based underbody protection with good corrosion protection properties and high stone chip resistance. Climate-optimized thanks to its special formula and can be used without any problems down to -10 °C. Very low VOC content.

Recoatability: With water-based paints after brief drying. Can be painted over with solvent-based paint systems after thorough drying. Due to the wide variety of paint systems available, we consider preliminary tests to be necessary
"



"Shake the can thoroughly before use. UBS AQUA PLUS is applied using the BODY-GUN III spray gun. The optimum

spray distance is approx. 20-30 cm at an air pressure of 2-4 bar (depending on the structure). Depending on the application, the product

can also be diluted with water. Clean contaminated surfaces and dirty equipment immediately with water. The product can be applied without misting

and does not drip. Contaminated surfaces and equipment can be cleaned with water while still “fresh.”

Opened (not empty) cans should be closed immediately after applying the product.

COMPATIBILITY:
For thicker layers, we recommend a drying time of at least 16 hours (overnight) at room temperature.
Recommended application temperature between 15°C and 25°C"
 
But if this work is to be done properly, you ll have to remove covers - because this is were rust could start and progress without noticing...

In the meantime, my Toyota dealer told me they use the following product: https://shop.makra.de/makrakundenportal/MemberPages/ProduktDetail.aspx?group=002&ID=301-501
(anyone heard of this brand?)

However this is water-based. I m taking a guess for environmental reasons (no other country in EU cares more about the env than Germany)
Being a water-based solution, I m not sure how effective that is compared to the more tested (wax based) Dynax/Dinitrol products

Here's the translation from the description:

"Water-based underbody protection

Environmentally friendly water-based underbody protection with good corrosion protection properties and high stone chip resistance. Climate-optimized thanks to its special formula and can be used without any problems down to -10 °C. Very low VOC content.

Recoatability: With water-based paints after brief drying. Can be painted over with solvent-based paint systems after thorough drying. Due to the wide variety of paint systems available, we consider preliminary tests to be necessary
"



"Shake the can thoroughly before use. UBS AQUA PLUS is applied using the BODY-GUN III spray gun. The optimum

spray distance is approx. 20-30 cm at an air pressure of 2-4 bar (depending on the structure). Depending on the application, the product

can also be diluted with water. Clean contaminated surfaces and dirty equipment immediately with water. The product can be applied without misting

and does not drip. Contaminated surfaces and equipment can be cleaned with water while still “fresh.”

Opened (not empty) cans should be closed immediately after applying the product.

COMPATIBILITY:
For thicker layers, we recommend a drying time of at least 16 hours (overnight) at room temperature.
Recommended application temperature between 15°C and 25°C"
Yes, if you’re handy though and have access to some ramps you can remove all the trim and liners yourself. Mine goes back for a free inspection and check over every year or so.

Not sure about the environmental aspects but Dinitrol is a German brand?
 
But if this work is to be done properly, you ll have to remove covers - because this is were rust could start and progress without noticing...

In the meantime, my Toyota dealer told me they use the following product: https://shop.makra.de/makrakundenportal/MemberPages/ProduktDetail.aspx?group=002&ID=301-501
(anyone heard of this brand?)

However this is water-based. I m taking a guess for environmental reasons (no other country in EU cares more about the env than Germany)
Being a water-based solution, I m not sure how effective that is compared to the more tested (wax based) Dynax/Dinitrol products

Here's the translation from the description:

"Water-based underbody protection

Environmentally friendly water-based underbody protection with good corrosion protection properties and high stone chip resistance. Climate-optimized thanks to its special formula and can be used without any problems down to -10 °C. Very low VOC content.

Recoatability: With water-based paints after brief drying. Can be painted over with solvent-based paint systems after thorough drying. Due to the wide variety of paint systems available, we consider preliminary tests to be necessary
"



"Shake the can thoroughly before use. UBS AQUA PLUS is applied using the BODY-GUN III spray gun. The optimum

spray distance is approx. 20-30 cm at an air pressure of 2-4 bar (depending on the structure). Depending on the application, the product

can also be diluted with water. Clean contaminated surfaces and dirty equipment immediately with water. The product can be applied without misting

and does not drip. Contaminated surfaces and equipment can be cleaned with water while still “fresh.”

Opened (not empty) cans should be closed immediately after applying the product.

COMPATIBILITY:
For thicker layers, we recommend a drying time of at least 16 hours (overnight) at room temperature.
Recommended application temperature between 15°C and 25°C"
Sounds fine to me, there is not that much to remove, i did it myself for my Yaris, and i do it for our clients. The price and material seems fine reading the description, wax based ofc would maybe be better, but anything is better than nothing. As far as i know there should not be salted roads in Germany, right ?
Anyway here are some pics from a Yaris Cross i did last weekend, under is very similar to a GR Yaris. There are like 3 bigger pans, 4 arch liners, and some other small bits, all fairly easy to remove.
Before and after

20251206_104103.webp

20251206_120647.webp
 
@Dav1d
Unfortunately not a handyman (that would have made things whole lot easier)
And you're right, I didn't know it was German
As with Dynax, there's an overwhelming number of products (so you can't really tell which is the 'best'): https://www.dinitrol.com/en/products/corrosion-protection/

@Armijs
That's amazing
But I m not confident with doing such job on my own (and also lack the equipment)
Best chance is to make a good price negotiation with my local garage, so that they do this job for me
As I think it ll also be very unlikely to convince the Toyota dealer to use Dinitrol instead

Just for comparison, the same work would probably be a lot more simpler on the A110:

1765312295191.webp


The GRY has a completely naked underbody
But again for the Alpine, it looks as if there are some really hard to reach areas (particularly around the suspension)
 
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