Tires can leak for many reasons. You could have a hole in your tire from a nail or screw or you could have a bead leak. A bead leak is a loss of air from the bead area. This is where the wheel and tire meet together to trap the air inside the tire. When you have a bead leak and you want to fix it at home, you can mix your own bead sealer. The idea of bead sealer is to place a layer of sealant between the tire and the rim.
Assemble the supplies together on a table or counter. You are going to mix these items together to make a thinner paste.
Place one cup of shortening in a bowl using a measuring cup.
Add half a cup of vegetable oil to the bowl.
Mix the ingredients with a fork until you have a thin paste that will brush onto the tire bead nicely.
Make sure you coat both tire beads very well so that you don't miss a spot. Another great bead sealer is rubber cement.