Rust inhibitor

Doing some body work this week on my 92 s-10. What's the best product you know of to use for rust?

I use a rust converter available at chain type auto parts stores to stop my rust. Paint it on and it turns a blackish purple overnight. I haven't tried sanding & priming it yet.

I've used products from Eastwood Company in the past with great results. here isa link to their page on rust preventative products:http://www.eastwoodco.com/jump.jsp?itemType=CATEGORY&itemID=372

I have use POR-15

the rust converters work real well, i used an aerosol spray on Permatex product back when i restored my mustang but i havent been able to find it anymore. like with most chemicals check for percentage of active ingrediants on the label, not all formulas are the same value.