I've used this for a few auto projects and I think it's worked well. With any rust treatment, it's all about following the instructions and this one is quite simple. You paint it on after removing the flaky rust and it will turn the rusted areas black and provide a clear coating, it recommends putting two layers on. You don't need a primer before applying the paint coat. The 3M rust converter isn't so easy or effective to use so this is the better one if the semi-flexible coating won't be an issue. Otherwise if you want just a converter, check ...the POR-15 rust converter as it's the best converter I've used and leaves a great rust-free surface. I'll try to update the longer term results as I have to check a test item I've painted about a year ago. Ease of application Slightly heavy/thick coating
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