How can you preserve an autograph in Sharpie on your MacBook?

Answer 1

I've only known this technique to work on paper when I used to do art but, Hairspray seemed to work for me; don't forget that was paper though. There may be a way to heat it on but you should really contact either your local Art specialist or your Apple Store for advice.

Answer 2

The Ideal conditions for display would be indirect lighting, at a room temperature of 65 - 70 degrees, and 50% humidity. Always check your signatures periodically for signs of fading or deterioration, and avoid excessive handling. If the sharpie signed "plastic" is kept in a plastic protector, keep in mind that if the conditions are not right the signature could sweat onto the plastic if it is in contact with it. I have seen this happen with photos kept in plastic sheets. I don't know what item you had sign but if you keep it dry in low humidity conditions it should be fine.