I ride my bike on a very regular basis. Obviously I'm sweating a ton. Even after I bring it inside into A/c house or near the de humidifier when brought back outside the sweat will still be moist. The paint on the frame is not absorbent nor are the rubber grips. Sweat does not always dry like water. Micarta will not absorb water. Even oils will not soak into the Micarta on my Randall shop Micarta.

The spacers however aren't chemical resistant and I'm not 100% sure they are watertight either. I have had them soften after some oil got on them. I'm speaking to the standard red/white/blue spacers.