Stickum is a trademark adhesive of Mueller Sports Medicine, of Prairie du Sac, Wisconsin, USA. It is available in powder and aerosol spray forms. According to the company website, the spray form is "excellent for bat handles and vaulting poles." Many vendors also promote the product for use by weightlifters, and for various other athletic applications.
Stickum, along with other adhesive or "sticky" substances such as glue, rosin (tree sap), or food substances, etc. were deemed illegal for play in the NFL in a 1981 rule named after Lester Hayes who used Stickum to improve his grip.