Over 40 years I’ve tried all the rust conversion products including the traditional phosphoric acid, other organic compounds and even the most expensive like POR15 which was a complete fail that made the rust worse following the directions to the point. Fertan is the most effective at conversion and has good penetration below the surface rust so I can feel confident that it has been eliminated. It’s capable of being welded through so for panel patches I treat the surrounding areas and inside panel to be 100% sure. Well worth the money to have confidence the rust is gone for good
Very good goes on easy with brush goes a long way. Doing the job nicely
Excellent product have used for years
Works as advertised. Used it on bus conversion and brother redid his entire boat trailer.
Great product, does the job and more