Do you mean on the sole of the club? If so, it wouldn't be out of the ordinary for normal wear to fade the paint. It may also come off if you may have hit out of the sand and chipped off a piece, allowing further paint to chip off from normal use. It is all situational, but I would say you don't have much to worry about. 

Hi Alex,

I play ap2 as well. My 6 iron has a little bit of the paint worn away... so I'm guessing it's normal? It never really bothered me much, but I think I did read somewhere others having a similar experience. 

Hello Alex.  I think the paint problem is normal "wear and tear".  There may be a paint product recommended by Titleist to touch up the numbers.  However, I generally use a felt tip pen or sometimes touch up paint.

If your club is new and the paint is peeling prematurely, then I would discuss it with the Titleist Service Department or the Pro Shop where you bought them.  Please forgive my French translation -- it has been many years since I last wrote and spoke French!

Bonjour Alex. Je pense que le problème de peinture est normal "l'usure". Il peut y avoir un produit de peinture recommandée par Titleist pour retoucher les numéros. Cependant, je utilise généralement un stylo feutre ou parfois une retouche de peinture.

Si votre club est nouveau et la peinture se écaille prématurément, alors je discuterai avec le Service Titleist ou Shop Pro où vous les avez achetés.

Hello,  If the numbers are coming off and you purchased your clubs less than a year ago, we will cover that under Warranty in the US.  Please take your clubs to a local Titleist pro shop and have them set up a Warranty repair.  We will repaint the numbers and send your set back to you. 

If you are in France, please contact UKConsumer@acushnetgolf.com for Warranty directions.

i'm in canada and the paint on the bottom of the club is simply vanishing i bought them last year at my club and since i am a golf teacher i got a good deal i bought them after July.

Please give Canada a call and they should be able to direct you to a shop and set up a repair under Warranty for you. 1.877.928.8898

Mine have done the same thing but I just consider them battle scars.  :-)

I have the 712's and almost all my irons paint has came off i just went and cut open one of my permeate makers and used the ink on that to fill in the numbers them cut open a can of gloss and used the gloss to help it keep it has worked well so far good luck.