Cracking the soles of your favourite shoes can be heartbreaking. But it does not have to mean the end of your shoes. Hard leather soles or deeply treasured shoes are best taken to a shoe repair shop for a sole replacement, but the soft rubber soles of everyday shoes and sneakers can be repaired at home inexpensively and effectively using Shoe GOO, a waterproof sealant developed for tennis shoes, or by picking up a bicycle tire repair kit from a local bike shop.
Wash the sole of the shoe well, using an old washcloth and some warm water. Soap shouldn't be required, unless the shoe sole has built up mud or other caked-on soiling. Let the shoe dry.
Apply a few lengths of masking tape inside the shoe, over the cracked area. This will prevent the Shoe GOO from bubbling through to the inside of the shoe.
Turn shoe over, fill crack well with Shoe GOO. Let the GOO dry and cure on the shoe for 24 to 48 hours. When dry and cured, the shoe GOO will be rubbery and spongy to the touch, and will bounce back to shape when pressed with a finger.
Remove masking tape from inside of shoe.
Wash the sole of the shoe well, using an old washcloth and some warm water. Soap shouldn't be required, unless the shoe sole has built up mud or other caked-on soiling. Let shoe dry.
Turn over shoe and outline the cracked area with a grease pencil. This ensures that you cover the whole area that is broken.
Apply a layer of the adhesive included in the kit over the area marked with the grease pencil. Let adhesive become tacky, as indicated in the manufacturer's instructions of the tire repair kit.
Apply the repair patch to the tacky adhesive. Press down firmly.
Allow glue to dry before wearing. Check the manufacturer's enclosed instructions for exact drying time.