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Re: Surface Rust

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07-09-2013 17:28:15

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B, you just gave the reason I don't use phosphoric acid, except in areas I can't get to mechanically. I simply don't trust it. And I have never had trouble with pits, rust, or anything else after sand blasting. If not sandblasted I use a fiber wheel on an electric drill for sheet metal. Slow and leaves deep scratches that a surfacer takes care of -- there is no rust left. But, I have used Picklex 20 or Must For Rust as a protectant on bare metal. Since then I have found I can leave bare metal inside for months with no rust, obviously I live in a dry climate. Different situation with Showcrop in NH, who lives in salt air.

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07-09-2013 18:36:36

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 Re: Surface Rust in reply to CNKS, 07-09-2013 17:28:15  
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What is salt air? I googled it and got just places and adjectives. Air here is the same as air in Kansas. I looked it up. True we probably have generally higher humidity, but the salt doesn't get into the air except in salt water spray right at the ocean, which may travel 50 yards in a really strong wind. I have a set of Oliver sheet metal in my shop that I sand blasted four years ago and it has yet to rust. I just don't trust sandblasting to get down into pits. I have, like every one else, found a lot of rust under some pretty decent looking paint, and I don't believe that the people that painted 25 years ago just painted over a lot of rust. I think that they cleaned it up shiny clean, except for the pits, which they probably figured were too small to bother. It really bothers me to see my professionally painted panels bubbling up where there were pits before the paint was cleaned off, and it was perfectly cleaned to shiny metal. Now I do it myself, and anyplace that there are rust pits gets acid wash, just like the counterman at the automotive paint store told me to.

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07-09-2013 19:07:48

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 Re: Surface Rust in reply to showcrop, 07-09-2013 18:36:36  
I used salt air as a slang term. However salt, whether on highways or just close to the coast has an effect. I grew up in south Texas, about 200 miles west of the Gulf, I went to college in Kingsville Texas in the 50's about 40 miles from the Gulf when cars and trucks had virtually no rust protection. It took only a couple of years for rust to start -- so the salt air does make a difference. All of my rust is gone, pits or not before I paint. I have only done this a little more than 10 years and have seen absolutely no paint lifted -- chipped, yes, but not rust. However all my tractors are inside, but I would expect the same outside. Before I paint the rust is mechanically removed. I do live in a different climate and I assure you the air is different, salt or not yours simply has more water in it. Some days here the humidity is as low as 10%, 15-20% being more common. High temp so far this summer is 110. I did a little painting in my building at a temp of 95--I don't particularly like doing it when it is that "warm". If I remember some of your earlier posts, the rust in the pits that lifted the paint was done by a not so professional painter, not you.

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