If you can’t work outdoors, open up your windows and turn on fans to ventilate the space. Some old cast-iron fences or gates might be coated with lead paint. Wear protective gear and wash your hands after touching it to protect yourself.
Be sure to wear gloves, goggles, and a respirator when using mineral spirits on cast iron. [4] X Research source
To make quick work of rust removal, use a wire brush attachment on a cordless drill. [7] X Research source You can also use a sandblaster or rust-removing chemical product instead. However, these options are more likely to damage the cast iron and are best left to professionals.
For stubborn paint, try 40- to 50-grit sandpaper. To smooth out the metal, finish with 120- to 220-grit sandpaper. [10] X Research source Make sure you wear a respirator, eye protection, and gloves when sanding away any rust or paint.
Mask any areas you don’t want to paint and lay down plastic or dropcloths beneath and surrounding the cast iron item to protect the surroundings from overspray. To spray on the primer, shake the can vigorously and then apply the primer in sweeping side-to-side motions. Alternatively, use a paintbrush or thick-napped roller to apply the primer to the cast iron.
If you’re painting a railing or ornate object, use a small brush to push the paint into the nooks and crannies.
