Rust if the result of a natural chemical reaction between steel and air. It's accelerated by increased moisture and corrosive agents like road salt and exposure to salty sea water. If covered with paint the metal surface is protected from oxygen and moisture - it won't rust. Rock chips, dents, scrapes or anything that breaks the paint's surface can allow oxidation to continue.

It sounds like you have a prefabricated chimney with a rusted chase cover. The top of the housing that is built around many prefab chimneys has a flat metal roof called a chase top or chase cover. Homebuilders nearly always use galvanized steel chase covers that begin to rust-out after about 15-years. Eventually, the corrosion will eat through the metal and cause a serious leak. We routinely replace these rusted-out covers with stainless steel chase covers that will last a lifetime. See similar questions...

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The way we remove rust from machined iron surfaces at the foundry, is with plenty of solvent (or diesel oil) and a scotch brite pad. Wear rubber gloves so you don't dry out your fingers. When the metal is shiny, wipe on a coating of oil to protect it. For areas that cannot be oiled, because of paper contact, try Johnson's Paste Wax. Rub it on heavy, and don't polish it off. It will self-polish, and protect in the mean time. See similar questions...

Long answer: Different steels are different (see "What's it made out of?" above). There is no "rust-proof" tool steel. The addition of carbon in iron (to make steel) means that it can corrode. Steels that are "rust-proof" do not classify as tool steels (like the 420 series steels used in knives sold in late night infomercials), and they can be used as knife blades, but they are weak and short lived. See similar questions...

Rust Converter is a synthetic polymeric formula that converts existing rust into a moisture free, black protective coating. Not only does it eliminate existing rust, but it seals out moisture to prevent the possibility of future rust formation and corrosion. Surfaces protected with this primer and an oil based paint resist the effects of weather, sunlight, rain and even salt spray without peeling or cracking as long as the oil based paint is maintained per manufacturer's recommendations. See similar questions...

Rust Remover will remove rust stains or red clay stains from any surface on your house or boat that is resistant to acid. See similar questions...

How concerned you should be about rust depends on what type of bike you have and where you live and how you use your bike. The worst-case scenario would be an all-steel bike, ridden regularly in the rain, stored outdoors in a town next to the ocean. That bike would last about 3 months before turning to rust dust. On the other hand, if that same bike were cleaned, waxed, and lubed after every ride and stored inside, it might last a lifetime. See similar questions...

Ideally, Rust Converter should be stored at room temperature out of direct sunlight. It should be protected from freezing or temperatures above 100 degrees F. Failure to follow storage instructions will cause this product to gel and become unusable. See similar questions...

For the best results, brushing on is recommended. For larger surfaces, pour on surface and spread with a broom, mop, paint roller or squeegee. See similar questions...

No. Although you do not have to paint after the Rust Converter application, it is recommended to apply a high quality oil-based paint if the item will be stored outdoors. Surfaces protected with Rust Converter and an oil based paint system resist weather, sunlight, rain and even salt spray without peeling or cracking. See similar questions...

You should not return the used Rust Converter to the original container. There may be a chance of contamination to the remaining Rust Converter in the container. Please dispose in accordance with all federal, state and local regulations. See similar questions...

The racks are made of steel electroplated with a layer of zine to prevent rust. The finishing of every panel is epoxy powder coated and oven baked to last. This is a better method as opposed to the usual method of normal painting or spray painting. Hence, you will find the same feel and touch as what you find on similarly processed window grills or door grills. See similar questions...

No. The aluminum tracks are made of heavy gauge, extruded aluminum, with a handsome powder-coated finish. The hardware is made of rugged fiberglass-reinforced resin, which has been UV stabilized to prevent yellowing or breakdown. The vinyl system is UV-treated to maintain true color indefinitely and is virtually maintenance-free. See similar questions...

No. The frames are 3/4" galvanized pipe and will not rust. The patio/deck retractable frames are anodized aluminum with powder coated aluminum castings and components. See similar questions...