I have provided an ecoat service for 3 of my customers(all B-Bodies) and they have spent 5-6000 for an alkaline dip and ecoat on the entire body. The ecoat process is about 12 steps including a 45 minute bake at 390 degrees and takes 3.5 hours. There are multiple clean and rinse steps. It is not a perfect product(the ecoat itself), but is the best way(IMO) to coat inside and out for maximum corosion prevention. Along with a rust inhibitor after the body is painted.

Brad