How to Waterproof My Child's Arm Cast

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There are few things more frustrating, for both parent and child, than the trauma and recovery from a broken arm or leg. Even if it isn’t summer, curtailing water sports and activities, there is never a convenient season of the year. Showers and baths can’t be put on hold. There is a range of commercial products for waterproofing casts (see Resources listing) that cost approximately $10 - $35, but do-it-yourself is the most affordable option.

How to Waterproof My Child's Arm Cast
(Lawrence Roberts/Demand Media)

Things You'll Need

  • Press ’n Seal (Glad brand) plastic food wrap, freezer-weight
  • Disposable gloves (optional)
  • Or
  • Bread bag or trash bag
  • Waterproof first aid tape
  • Hair bungee or rubber band (optional)
Step 1

Unroll a few inches of plastic wrap -- enough to lay the sticky edge along the length of the cast.

Lawrence Roberts/Demand Media
Step 2

Wind the wrap around the cast several times, pressing it snug to the cast with your hands as you work all the way around.

Lawrence Roberts/Demand Media
Step 3

If the cast is longer than the width of the plastic wrap, keep covering it in progressive layers up or down the length until it is thoroughly covered.

Lawrence Roberts/Demand Media
Step 4

A final round at each end should extend beyond the edges and adhere snugly to the skin. This final seal is more comfortable to remove than any kind of tape. If you want a little extra assurance, you may add a round of tape over that final seal.

Lawrence Roberts/Demand Media
Step 5

If the cast includes part of the hand, it will be difficult to seal these edges. Slip a disposable vinyl glove on your child’s hand and add another round of plastic wrap or tape to seal the cuff.

Lawrence Roberts/Demand Media
Step 1

Use a bread loaf bag for a child’s arm and hand; a sturdy trash bag will fit well over the foot when if it is a leg cast. This time-honored method of waterproofing casts for both adults and children and is recommended by Varsity Orthopedics.

Lawrence Roberts/Demand Media
Step 2

Carefully inspect a used bread bag to make sure it has no tiny holes or tears that might leak water inside.

Lawrence Roberts/Demand Media
Step 3

Slip the bag over the cast and secure the whole end by wrapping with a round or two of tape, overlapping the edge to adhere to the skin. You might use a hair bungee or rubber band before taping, but be sure it is not too tight.

Lawrence Roberts/Demand Media

Tips & Warnings

  • If your market doesn't carry freezer-weight Press 'n Seal, plan to use a few extra rounds of the regular weight.

References

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