I just got a brand new Fortis Flieger. The screw down crown feels a bit "rough" when screw/unscrew it. Is it okay to use WD-40 on the crew to remove the "roughness"?
Is WD-40 okay for watches? Will it kill or eat through the water proof seals of the watch? Especially at the crown? Some of the bezels on my diving watches feel a bit tight also - I was thinking of using WD-40 on them to make them turn a bit smoother (not going to flood the watch with it, just a moderate amount).
So whats the consensus on WD-40? Will it kill watches?