A rabbit cage should be well-maintained and kept clean, both for the happiness and comfort of the animal and to keep the area where the cage is kept looking nice. Rabbit cages and any other objects that come in contact with animals should always be painted with nontoxic paints. Animals often chew on their cages and can become ill if they ingest paints with lead or other poisons in them.
Find temporary accommodation for the rabbit. Clean out the cage thoroughly, and lightly sand any surfaces that you are going to paint.
Prime the cage first if it is made of bare wood. Allow the primer to dry for at least one hour if it is water-based, and 24 hours if it is oil-based.
Paint the cage using a paintbrush. Only paint solid surfaces. Don't attempt to paint screens or wire. For best results, apply paint very thinly, allow it to dry, and then apply another thin coat. This will look better and last longer than a single thick coat, which might run or look lumpy.
Close the paint can by tapping the lid on with a hammer after you are finished painting. Clean water-based paint off of brushes using water. Clean oil-based paint off with paint thinner.