Rust Remover & Converter

[Mike Bucher <mbucher@domain.elided>]

Ran across these products that are used by some of the antique tractor
crowd.  Anyone use any of these?  Comments?
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http://www.agriculture.com/contents/gemplers/

GEMPLER'S Rust Remover

 Save hassle and expense removing rust
 when restoring equipment, tools,
 hardware or engine parts 

 New-technology, heavy-duty Rust Remover restores any rusty iron or steel
surface without the hassles of sanding and grinding. It
also eliminates the dangers of using harsh, caustic acids to remove rust.
Simple, easy-to-use formula is completely water soluble, biodegradable,
odorless and nonflammable.

The first step is to brush away loose rust and remove oil and dirt. Then,
place items in an open container, tub or tank (do not use a galvanized
container) and pour in enough rust remover to completely immerse the item.
Rust Remover can be brushed onto surfaces, but soaking is more effective.

Allow item to soak until derusting is complete; 30 minutes to several hours
or days, depending on severity of rust.

To speed derusting, heat the solution to around 170°F (but not to boiling),
brush away loose rust sludge every 20 or 30 minutes. If corrosion is
extremely heavy, overnight soaking may be required. Rinse derusted item
thoroughly with tap water and dry. If surface will not be painted, lightly
oil the surface to keep it free of rust. Rust remover
may be used over and over to derust several items until its strength is
depleted. 
     Two-year shelf life.

     Sizes:
              One quart (Item # R425): $8.95/ea. 
              One gallon (Item # R174): $ 29.50/ea. 
              5-gallon Pail (Item # 1731): $115.00/ea. 


GEMPLER'S Rust Converter

Chemically converts rust to an inert, black, protective barrier
that you can then paint over.  Stop further rusting of old tools, vehicles,
wagons, implements...anything with a rusted steel or iron surface with this
new technology, water-based product. All you need to do is to first wire
brush the surface to remove scale. Then apply RUST
CONVERTER with a paint brush. Treated surface is primed and
  ready to paint in 24 hours or may even be left unpainted.
One-gallon container covers up to 400 square feet. Environmentally
safe, non-flammable without choking fumes.

Do not allow Rust Converter to freeze. One-year shelf life recommended.
Easy-to-follow instructions on container.

     Sizes:
              Quart (Item # RCQ): $9.95 each
              Gallon (Item # RCG): $34.95 each
              4-Gallon case (Item # 550A): $119.80 per case