After you have adjusted to your splint or cast for a few days, it is important to keep it in good condition. This will help your recovery.

Keep your splint or cast dry. Moisture weakens plaster and damp padding next to the skin can cause irritation. Use two layers of plastic or purchase waterproof shields to keep your splint or cast dry while you shower or bathe.

Do not walk on a "walking cast" until it is completely dry and hard. It takes about one hour for fiberglass, and two to three days for plaster to become hard enough to walk on.

Keep dirt, sand, and powder away from the inside of your splint or cast.

Do not pull out the padding from your splint or cast.

Do not stick objects such as coat hangers inside the splint or cast to scratch itching skin. Do not apply powders or deodorants to itching skin. If itching persists, contact your doctor.

Do not break off rough edges of the cast or trim the cast before asking your doctor.

Inspect the skin around the cast. If your skin becomes red or raw around the cast, contact your doctor.

Inspect the cast regularly. If it becomes cracked or develops soft spots, contact your doctor's office.

Article Source: http://orthoinfo.aaos.org/topic.cfm?topic=A00095&return_link=0