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Old 02-19-2013, 11:54 PM   #11
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Location: Oregon City, OR
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Rust issues

I've used an item called Ospho, available at most Wilco-type feed stores and maybe Home Depot's. It's an acid based that encapsulates the rust then it can be painted and the rust won't keep growing. Just be careful painting it on over yourself, it can't be bad for eyes, etc. It definately worked on a Jeep I was fixing up. Kept the rust under control and allowed me to paint right over it.


Steve & Jane & Smokey the ferrel Cat
2001 F250 SD, 7.3 Diesel, CC, SB
2013 Wildcat Maxx 313RE Touring Ed.
Days camped 2013 = 51 (as of 26 Apr)
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Old 02-20-2013, 05:57 AM   #12
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I had the same problem----------

RIP, you must have received your RV during the winter/ snow season. I had the same problem on my 2011 fifth wheel for I picked it up in January from RVWholsalers in Lake View Ohio. There was 6" of snow on the ground at the time I picked, the unit had been towed from the factory in Indiana
also with snow on the road. The salt that is applied to remove the snow is what is causing all the rust and deterioration.

I can see even the brass fittings are green from the salt and the screws have began to deteriorate. After returning to Florida from picking up my fifth wheel in January, I set out with a good pressure washing of all the under carriage. I even removed the wheels on each side so I could remove as much salt as possible. After the under carriage dried for a couple days.
As mentioned in a early post as using A chemical by the name OSPHO to treat the rusty areas. I used a same chemical by another name called "PREP & TECH" by KLEAN STRIP (phosphoric chemical) from Lowe's or Home Depot. It is the same chemical by the name of OSPHO. Just a little cheaper. I applied the chemical with a pump up sprayer and a quart plastic spray bottle along with a brush. This is a sort of a time consuming job, but it works. Follow the directions on the chemical container. It states it removes rust from metal surfaces & inhibits flash rusting. It also insures good paint adhesion. Again just follow the directions about application. I used a good black paint by RUST-O-LIEUM to paint all the surfaces. I purchased new screws, replaced all the rusty screws (lots of them). On the box tube of the frame near the wheels, I sprayed foam (INSULATION TYPE) into the ends of the open box framing. After drying of the foam, I used a hack saw blade to remove the excess foam that bulges out of the box tubes (FRAME).

I spent of lot of time a my back with a mechanics creeper to accomplish the task of the work to be done. Over all about a week!
As stated by the X coast Guard fellow, he can tell you about rust. Well I can too after 28 years in the Navy on lot of old WWII type ships.

Good luck.

Sid, Lois & HRH MISSY Terrible 2s SHIH TZU
2011 ROCKWOOD 8285 WS
2014 F-250 KING RANCH PS/SD/6R140/BFT
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Old 02-20-2013, 02:30 PM   #13
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every spring I go around with a wire brush and 3-4 cans of flat rustoleum spray paint. I brush the worst off and hit it with a quick coat. I can say that it only takes an hour or so till I run out of paint. Done til next year. It's also a good time to look for frame cracks and other damage.
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.
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Old 02-20-2013, 02:36 PM   #14
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Por-15 is a true rust eliminating paint, there are other out there. My understanding is they chemically neutralize rust with high zinc content. Frankly overkill for most projects, but the end result is incredibly durable.

2013 Coachmen Freedom Express 320BHDS pulled by a 2005 F250 King Ranch CC

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Old 02-20-2013, 02:52 PM   #15
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I also spray painted my pipes along with the frame. Just remembering my 6 days aboard a Canadian Navy frigate way back when. I spent time in the basement and then moved to the blunt end. Finally made it to the pointy end. Not the life for me. I liked my tank better....

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