Right away: It works well. Formerly stuck rust comes off as a brownish-gray mud. After that, the steel covered with a fine-grained dark gray phosphate layer. The information material with the processing instructions you should definitely read. Also you should have understood that phosphating is no long-term rust protection, and you need an extra coating on time, but for the phosphate coating is an excellent primer; This applies to everything that could be called "painting". However, if a subsequent galvanic coating is planned (tin, zinc, chromium, silver, gold, etc.), the phosphate layer rather disturbs. The same is true for hot-dip galvanizing. There may be additional costs. Those who intend such, takes better advance with the further processing plant contact and ask if a rust remover is suitable based on phosphoric acid. Also, a Web search for the keyword "corrosion protection" can help here. The "highly concentrated industrial grade" has me a bit confused :) Initially I was not sure whether the canister contents should not be diluted. (No, he is probably not!). Thread lock: True, hard going. But if you only times the "overcap" withdraws, and then can grab the actual cover better, it's not that hard. It is probably better, you have a child safety when something inedible looks so appetizing. What still stands out is the very strong temperature dependence of the reaction. With currently around zero outside, the effect is very weak; In immersion bath at body temperature, it is much faster. This may explain the disappointment that describe some users here. But that is a hallmark of the method and not this specific product. For things that can be inserted into a bath, this method has advantages in principle. Unlike mechanical process, the solution really works everywhere. With brushing, rolling or spraying I've no experience.
Conclusion: The product guarantees when properly application a complete rust removal, which produces a phosphate coating as a primer. It stands another, in some cases considerably more expensive means, as far as I can tell so far, in every way. Ideal are small parts that you can immerse yourself. Probably not suitable for subsequent electroplated coatings (ask!). It should not be too cold when outdoor use.
