For some reason the letters 'printed' in mbp keys seem to be peeled. It is not that I got big nails, I do not know the reason. Maybe I stroke the keys a lot. I bought a transparent film to put in mbp keyboard. You may have seen some of them on the market. It protects the keys. But I wonder if this solution make any harm to mbp air circulation. I am not sure but I think that maybe mbp uses the space between the keys to supply with air the inside machine. What do you know about air circulation inside mac laptops? Is there any possibility that these films on the keyboard damage or overheat laptop?