Originally posted by krissly1:
Most if not all the rust inhibiting products on the market contain a zinc phosphate additive. This is the same additive that some of the paint products mentioned in the earlier posts. As for the Golden Gate Bridge, there are a few reasons. It would be costly, a controlled enviroment is preferred for the proper application of this type of product and containment during application of phosphoric acid on such a large scale could be hazardous as well as a liability. General Motors and any other auto makers would have no reason to make an automobile last forever. Therefore it would be not cost effective to treat the sheet metal for lifetime corrosion protection.
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No, most "rust inhibitors" do NOT have any zinc in them. There are "pretreatments" like POR's Metal Ready that do, they are a metal conditioner like DuPOnt, Sherwin Williams and every other company has had for half a century or more. But the government doesn't make them put the % on the MSDS (which I have in front of me). I suspect it is very little. It is largely phosphoric acid. POR-15 paint does NOT have anything of the sort, neither does Zero Rust paint as far as I remember. These products COVER UP the rust, they do not convert it in
ANY WAY.
Now, if you think there would be a money issue in protecting one of the most recognizable land marks in the entire world (The Golden Gate Bridge), you are mistaken. And what would that have to do with off shore oil darricks? Why don't they use it there? Now remember, they use a zinc rich primer, POR has NO ZINC in it.
Your kidding me about GM not wanting to make a car last forever right? Of course they want to make it last forever. That is why there are 100,000 mile rust thru protection (with the zinc galvanizing and primer) and 100,000 tune ups and so on. It is a misconception that they "want" the car to wear out so you will buy another. We will buy new cars because we WANT new cars. This is America remember, do you really think all those people in the new $60,000 Cad Escalades bought them because their "old" car wore out?
Do you think all the cars in the wrecking yards were unusable? Send them to some third world country and you will see them last another 40 or 50 years and a million miles! We are a wasteful society. The MARKETING dept would love to say to someone that the car would last forever. People would love to hear it, they would not keep the car that long, but few think they are going to "not want" that new car they love today in a few years.
