Rust, or corrosion, or electrolytic action is enabled by exposure to water and air. Stop that exposure by placing a barrier between the metal and the air - such as oil or rustproofing - and the corrosion is effectively stopped. Whatever damage there already is will not be undone but further damage is effectively halted.
The worst rust damage occurs from within and also from those areas that are not allowed to dry out thoroughly after becoming damp from water or condensation. The only way to access those hidden areas is to drill access holes and introduce the rustproofing product directly into contact with the metal in those hidden areas. Look at rocker panels. They rot from within not from the outside. Spraying them from the outside is not going to be effective. Spraying them from the inside after drilling a small hole to allow for that? Definitely going to get much better results. For those who are concerned about drilling holes, the alternative is to let that area rust - not hard to make the choice. The holes are surrounded by rustproofing product - you really think that drilled hole is going to be a rust-prone area??
Corrosion Free actually talks about getting the vehicle sprayed no later than 3 years after putting the unit on the road. Regardless and bottom line, rustproofing will tend to hold the rust at the point its at right now.
The training for almost every rustproofing product requires the installer to spray enough product to cover the surface. Inevitably, either the customer or the installer usually subscribe to the 'If it isn't dripping, there isn't enough on it' theory which leads to excessive use of the product per vehicle and dripping for days afterward. The guideline is that one barrel of product can cover about 50 standard sized vehicles. Less vehicles per barrel means too much product has been used (or there were a lot of trucks and large SUV's put through that week).If properly applied, there should be virtually no dripping after application.
Last edited by terrydale
on Wed Nov 30, 2011 7:32 pm, edited 1 time in total.
Member: CASC (TSOA, St LAC)-1963/MCO-1967
MCO Past President: 1974, 1993, 2007-2010
1953 Meteor/1977 TR 7-V8/1983 Yamaha Seca 900
Multi-Certified InterProvincial Technician (310G, 310S, 310T, 717B)
ASE Master Automobile Technician