Get A Grip Bowling Cloth.
This cloth will stop you hand from slipping while playing bowls. A cloth that is tacky so it will help with your grip.Very popular.
Can be used many many times so it will last a very long time. It is very safe even when using gloves as it does not stain.Stops you from heavy gripping so you hand can be more relaxed. and the bag can be re-sealed after use.