It is not uncommon to find wooden banisters that are painted. These vertical supports for porch and stair railings are usually finished with paint to protect the underlying wood from damage. But over time, painted banisters tend to chip and wear. The best way to refinish a banister is to strip it completely of paint. This is accomplished using a few effective tools and some time.
Tape off the areas surrounding the banisters with a dust sheet and painter's tape. This may only be necessary for indoor applications.
Apply paint remover to the banisters with a paintbrush or clean cloth. Check the label on the solvent to see how long you should leave it on to soften the paint.
Use a putty knife to scrape the layer of paint off each banister. Use light pressure, so as to not scar the underlying wood surface.
Dampen a steel wool pad with white spirit. Remove any remaining paint by rubbing each banister with the wool pad.
Spray the banister with a hose if outdoors. For indoor applications, a clean cloth dampened with white spirit will do fine. Remove any remaining residue from the banisters.
Allow the banisters to dry completely before attempting to repaint them.
Wearing rubber gloves will prevent and skin irritations from the chemical solvent. If your banister has more than 2 or 3 layers of paint, you may need to use a brushable paste form of paint remover.
Always use chemical solvents such as paint remover in a well-ventilated area.