https://www.youtube.com/watch?v=Ag46YUovPUc&ab_channel=ProjectFarmI know a lot of people have asked about rust converters and POR-15 is the most recommended brand by those that paint and restore our trucks on here. Project Farm which if you haven't seen his youtube i suggest you take a look. he test a lot of products from nails to screw guns. His test have shown if you want to be cheap and do an "ok" job then Rust-oleum rust remover is a good choice. but if you want the best of what he tested then it is POR-15 but it comes with a much bigger price tag.