linseed oil is a traditional finish on ash snooker cues. i use it on the snooker cues i have...it does darken and can give a yellowish tint to the wood. it can also take forever to dry....i use a polymerized linseed oil which dries much faster. when dry though, it is very nice and slick. it has to be pure linseed, the stuff they sell as 'boiled' linseed oil has metal driers and stuff in it, which will make the shaft sticky. i don't think the protection is that good though, doesn't seal against moisture that well, but it is a tradition in the snooker world which has continued to this day