How Hard is NanoSlic? Lily Wood October 29, 2018 18:42 Updated Follow When fully cured, NS100 series and NS200 series develop 9H pencil hardness according ASTM specification D 3363. Related articles How Thick is NanoSlic? Is NanoSlic Permanent? Can NanoSlic Be Used on Anything That Comes in Contact With Food or Drinking Water? Does NanoSlic Work in High Humidity? Does NanoSlic Protect From Ultraviolet Light? Comments 0 comments Please sign in to leave a comment.