Let's Talk Undercoating/Rust Protection
 

One thing I've been concerned about recently is the underside of my ride during the winter. I'm aware that it's a good idea to seal the paint and plan to have Brendan of ProjectDetail sort me out as he did last year. However, evos are known to rust quite easily and I'm paranoid about keeping the underside protected this winter as it's not something I was aware of until recently.

Being raised in the Caribbean I've never had to worry about these things (unless you live right by the beach in which case you're fucked). What are the options and costs associated with coating/protecting the underside of the vehicle from salt and the elements of the road.

Please share your experiences and any places you recommend.