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Old 08-25-2011, 10:50 PM   #1
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Rustproofing the RV?

I recently purchased a 2005 34 ft National Seabreese and failed to look closely underneath the riguntil this past weekend when I crawed under to take a good look. Yes I deserve all the scolding that I get for fessing up to that. There is a lot of surface rust and I dont know what to do? Shall I leave it? Shall I get it sprayed with Zeibart Penatra-oil ; Rsut check or Krown or What. I called around and all say to use them and the others or bad. Any Ideas?

John
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Old 08-25-2011, 11:58 PM   #2
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Surface rust on primary chassis components is rarely an issue sine the rust never compromises the integrity of the metal parts due to their substantial thickness. On the other hand, rust on metal parts that are thin should be addresses since the rust can eventually eat away the component. Motorhomes normally have lots of thin-metal parts that are prone to rusting. These parts should ideally be cleaned with a putty knife and a wire brush or a wire wheel attached to a drill. They should then be wiped clean, primed, and painted with a good "rust'proof" enamel. Then, all you need to do is keep an eye on them every couple of years.

In addition, Wal-Mart sells cans of rubberized paint that is used by body shops. I can't attest to its effectiveness but supposedly, it prevents rusting for a while. In any case, you would still need to prep the surface as described above. Best of luck.
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Old 08-25-2011, 11:58 PM   #3
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The best: http://www.por15.com/

Cheaper and works: Eastwood Rust Converter - Convert Rust in One Step

If its just really light rust, I use this.. works real good: Rust Converter, Black Flat Finish, 15 Oz - Paint Primer, Sealers & Rust Reformers - Paints - 5HE25 : Grainger Industrial Supply
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Old 08-26-2011, 12:08 AM   #4
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Another option is Ospho from your local hardware store. It is about $10 per quart.

All of these rust "converters" are based on phosphoric acid. Iron Oxide + phosphoric acid + H2O (humidity) gives you iron phosphate (a hard black substance) plus the various leftovers.

Rinse the iron phosphate off with water to get rid of the excess acid, let dry and prime with a good red primer and then paint with an oil enamel and you have many years of rust protection.
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Old 08-26-2011, 07:52 AM   #5
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Being in the facilities field, I use Loctite 754. I do not know how it rates against the others.
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Old 08-26-2011, 01:50 PM   #6
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I had an 06 Tropical and the basement fell to the road from the cross members being badly rusted. My shop and I had to rebuild the complete bottom framing, what a chore. I bought it that way and it was my fault for not getting under it. Bought it in Fl but it was regestered in Canada.
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Old 08-26-2011, 02:16 PM   #7
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Quote:
Originally Posted by wirelessenab View Post
Another option is Ospho from your local hardware store. It is about $10 per quart.

All of these rust "converters" are based on phosphoric acid. Iron Oxide + phosphoric acid + H2O (humidity) gives you iron phosphate (a hard black substance) plus the various leftovers.

Rinse the iron phosphate off with water to get rid of the excess acid, let dry and prime with a good red primer and then paint with an oil enamel and you have many years of rust protection.
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