I've carried a burgundy micarta Jester on my key ring since 2003. It has been dropped numerous times to the pavement, banged around in my pocket, and generally been treated less than kindly. It has one small chip from one of the falls but, aside from that, would be hard to tell from one of my BNIB spares. Micarta has been used on kitchen knives for over 70 years, so I don't think moisture, regardless of source, would ever be an issue. I have noticed that white micarta tends to develop brownish stains around the pins. Have a hunch it's from lubricant. And, as with CF and G-10, prolonged exposure to sunlight can cause it to fade. Beyond that, the stuff is pretty much bulletproof.