Has in my case the problem solved

My Story
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I drive a big white SUV (comparable in size with an Audi Q7) - after about six months, I have discovered ringsrum rust in the lower body area. It has then been found contact with the workshop as rust - this is covered by the warranty.

Application
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- I have the car washed (not in the sun!) Applied over a large area and the means.
- After a few seconds form purple points, indicating that the product is effective here (see photos).
- It was interesting that there was a lot of purple in more places than I had expected because of the rust spots.
- After a few minutes I have washed away everything.

Hint
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First, I had sprayed only the directly affected areas - that was a mistake. The rust was potentially also to previously "invisible" places available -> I recommend, therefore, to treat the entire vehicle (possibly miss the roof - as I had no "purple patch").

A bottle has "just so" enough for my car.