Here is an example of another type of crack common in many of the older bows. These are actually in the glass rather than the finish. Again, some are worse than others. Some bows might just have one short crack near the riser, while others of the same model and year might be covered with them.
They can sometimes be hidden to some extent, but they really can't be removed. Although they are in the glass itself, since they run the same direction of the limbs they are generally safe to shoot. Lots of bows still in the woods today that have cracks like this.