Select from options: Continue writing the next sentence.

How to paint cast iron
Remove any rust on the cast iron.
You may be able to use a wire brush to scrub off the rust. A sandblaster or rust-removing chemical products can also be used if you need to take off a lot of rust and are not worried about possible damage to the cast iron.

Options are:
(1). If you don't want to use a paint brush, you can use a toothbrush to clean it away. Always keep all of your brush holders clean and dry before using it to remove the rust from cast iron furniture or finished artwork.
(2). Wear proper safety equipment if working with a power tool or chemical to remove the rust. This may include gloves, goggles and a respirator.
(3). These products are generally not too toxic unless they are applied with water, but they may be very expensive. Rust can be treated with a mineral spirits solution or with canola oil.
(4). The rust can be lifted before you apply any filler. Use a stiff-bristled brush to brush off caked-on rust, replacing as much of the enamel as possible.
Answer:
(2).