What is the ruling when a player sprays water repellent on their golf ball during a rainstorm?

When a player sprays water repellent on their golf ball during a rainstorm, the ruling is that no penalty applies. The Rules of Golf allow players to take reasonable measures to maintain their equipment and ensure playability under adverse weather conditions. Spraying water repellent is seen as a proactive approach to keep the ball from getting wet and potentially affecting its performance on the course. As long as the action does not violate any specific rules regarding altering the condition of the ball or using prohibited substances, it is permissible.

Therefore, in this scenario, the player would not face disqualification, a penalty, or the requirement to replace the ball, since they are simply trying to manage the conditions of play in a reasonable manner. The correct understanding is that players are encouraged to take necessary actions to ensure that their equipment functions correctly, especially in challenging weather situations.