By nature I am very skeptical of such products.
Promise will be the metal completely stopped after 3 hours of rust here. This is of course a statement which almost sounds unrealistic.
Since I did not get the desired results with the Nigrin rust converter, I have now resorted to this product.
The application is relatively easy.
With a fine brush, the fluid rebels and then thin to the point rust Apply (remove loose rust, etc.). The liquid also is relatively much, take that into consideration. Wear disposable gloves can also be useful. Then you see nothing at first.
After a few hours, the point at which the agent has been applied, black. Much more can not be seen at first glance.
The black Something has a fairly firm consistency that you get only with a cloth and powerful roughing or sandpaper down. Whether paint, metal or rust. Black it is always.
I have used it. On my car That means I'm following procedure and so far it looks good (no rust).
1. Coarse grind, scrape off rust
2. Rust-brake
3. (1 day later) sanded back to bare metal
4. polyester resin with glass fiber mats on a hole in the sheet metal
5. Feinspachtel
6. just grind
7. paint
8. clearcoat
So I'm vorgangen far at all points. Depending on the damage without step 4.
So far, it looks good. Wait and see.
In any case, a black spot does not look as bad as a brown rust stain. So who is already helped ...
I think I would buy it again. Definitely better than the rust converter of Nigrin.
4 stars because of the long-term test is not passed.
I'll post some more experience with it in a few months.
Update October 2014:
Unfortunately, the problems in the appropriate places are still there since and again. However, it has not done anything worse and it has certainly helped a little. Nevertheless I'll stay with the previous review. Helpful in div. Rust I find Nigrin 74061 underbody protection. This helps better if it was not also looks nice, but the wheel arch justifiable.
