Brother Happalon's enchants a target item to a certain level depending on a number of factors. It can continue to be cast on a particular item until a backwash of thaumic energy is seen. At this point, that item cannot be enchanted further.

 

Various items will have differing points at which the backwash will occur, even aside from the influence of the caster's skill. Clothing and jewellery for instance, will almost never go beyond slightly enchanted, and you will not be able to enchant the vast majority of items past softly pulses in dull octarine shades with this spell, regardless of skill.