Autumn and children go together like peanut butter and jelly.
Pumpkins (any size)
Acrylic paints (any colors)
Select a firm pumpkin. One that is soft or bruised may rot.
DecoArt.com suggests misting pumpkins with a coat of spray sealer instead of painting the sealer on with a brush. If you chose this method, be sure to spray outside or in a well ventilated area.
Consider sealing the pumpkins a few hours before the children are ready to paint. This will keep the kids from getting impatient waiting for the sealer to dry.
Have children wear smocks or old shirts so the paint doesn't stain good clothes.