One other thing to be aware of; if your bowl is relatively thin and you apply stain to the end grain areas, it can easily bleed through to the other side of the bowl (inside to outside or vice versa), as the stain will flow along the fibres of the wood. I am not aware of any way of stopping that apart from having a good thickness of wood to soak up the stain. But that goes against most turner's desire to have relatively thin walled vessels.