Rust Neutralisers

[Torquemada]

I have read various threads re chassis painting and protection, but there has been no mention of so-called rust neutralisers/converters such as Kurust/RustMaster.
Has anyone used these prior to Hammeriting? My theory is that I can save on the wire brush elbow grease if I stabilise the rust with one of these products. Any opinions? Thanks in advance.