Some players put excess pine tar on their helmet so they don't have to go back to the on-deck circle for a refill. If they feel, during a plate appearance, they need some more grip, they just wipe some from the helmet. read more
Pine tar on helmets is not deliberately put there. Pine tar ends up on helmets as a result of pine tar that is transferred from the bat handle to the batting gloves and then players, with fresh pine tar on their batting gloves, adjusting/pushing down their helmets as they go through an at bat. read more
Players stick it to their helmets so that when they go up to bat they have some to grab to put on their batting gloves because Pine tar is designed to help keep a better grip on a bat. read more
Best Answer: They don't intentionally put on their helmet, the put it on their bats, and then adjust their helmet with the same hand. Some baseball players are really grimy and don't get new helmets very often. You would think they could afford new helmets or a tip to the bat boy to clean it off. read more