I used to use two things, firstly I'd give the saddles an adequate coat of Gee-wy. Once that was absorbed and the leather was dry to touch I would cover them with glycerine soap and get a nice thic white lather going. Once the lather is dry I gently rub the resultant waxy coat even. It goes transparent and seals the leather and stops the Gee-wy evaporating. Unfortunately they stopped making Gee-wy and replaced it with “Gee-gee”. Not sure I like Gee-gee yet.