Thanks guys, for adding on this topic, today I've called a guitar store and ask about it also, the seller told me that he plays for 16 years now, with the same accoustic and never had to use any product, but he always store the guitar in the case, I guess I will start doing so, as right now, I have them on the wall, that looks cool and easy to pick up, but now that I am learning this, it is not worth it.

thanks again for your answers!

cheers