First, you cannot fix the damage already done but you can repair and stop the rust from doing more damage. Take a fine sandpaper or a wire wheel or steel wool and remove all the rust from the gun. After the rust is removed, reblue the gun with a solution made just for this. Ask any gunshop for the solution you need. If the damage is to the point to make the gun unsafe to use as in holes in the barrel or in the firing mechanisms, you may need to replace the effected parts.
Water and aluminum foil can remove surface rust on the chrome of a gun. Steel wool can also be used to remove rust. It is advised to never use a oil to remove rust or to clean a gun.
Blue is a type of rust finish
Oxidation of the steel of a gun barrel.
the best way to stop surface rust is to sand the spot of rust off and then spray it with some primer to keep the rust from coming back
Interior or exterior?
50-200 or more depending on size, amount and location of rust.
buy another pail
It will rust eventually.
clean, no pits or rust.
To ensure smooth operation and prevent rust.
It depends the level of rust and degradation but yes usually minor rust is available to fix with a liquid which decreases rust and the things associated.
If you are looking to do something such as fix car rust it is a good idea that you leave this kind of thing to a professional because if you do not do it properly it can mess your whole car up.