How to make a quick arm cast

Updated April 17, 2017

Plaster casts can make interesting art. Pregnant women have their pregnant torsos cast. Plaster masks form the shape of student's faces in a variety of classes from art to social studies. Craft plaster is available by the roll, and people can use it to create art from an arm cast that can be decorated for display or given as a unique gift.

Generously rub petroleum jelly over every part of the arm the cast will touch, especially if there is any hair on the arm. Lean the elbow on the table, keeping the arm vertical to the floor.

Cut eight long strips from a roll of plaster cast. Dip the roll of plaster cast into a bowl of water. Begin at the hand and wrap the cast across and around the base of the hand two times. Wrap between the thumb and pointer finger and around the base of the hand. Then wrap after the thumb and around the hand. Repeat this at least three times.

Begin moving away from the hand, wrapping the arm around the wrist and then move slowly up the arm. Wrap at least 10 cm (4 inches) above the wrist. Continue wrapping and move back down. Wrap between the thumb and finger again and wrap up the arm again. Continue until you use the entire roll of plaster craft.

Moisten your fingers and smooth the plaster on the cast to give it a finished look. Wait about five minutes and gently slide the hand out of the cast. If it is too tight, cut up the side of the cast and remove it. Repair the cut with the eight long strips you initially cut off. Again, smooth the plaster to give it a finished look. Set the cast on waxed paper and allow your craft to dry. Decorate it any way you want with markers or paint.


Don't wrap too tightly to make removal easier. Keep a spray bottle of water on hand to moisten the roll if it begins to dry out.


Craft plaster rolls are for crafts, not for medical use.

Things You'll Need

  • Bowl
  • Water
  • Scissors
  • Spray bottle
  • Petroleum jelly
  • Markers or paint are optional
  • 1 roll of plaster cloth 10 cm by 4.5 m (4 inches by 15 feet)
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About the Author

Joan Collins began writing in 2008. Specializing in health, marriage, crafts and money, her articles appear on eHow. Collins earned a Bachelor of Arts in education from the University of Northern Colorado and a Master of Arts in instructional technology from American InterContinental University.