I use rain chalk alot on all my pot calls except my slate. It really does eliminate some of the striker slipping. On a really slick surface it really makes a difference on consistancy. It is messy as someone else mentioned. On a darren dawkins aluminum call he sent me a pool cue chalk cube. Use your striker on it like your chalking a pool stick. Just a very light coat works wonders but too much is like not having any. Hope this helps someone