Tackiness can be caused by one of the following:Not mixing enough at one time. We recommend mixing a minimum of 2oz (30ml Resin : 30ml Hardener) at one time.Incorrect mixing ratio. Too much hardener can cause a tacky surface, when mixing small amounts this is a common occurrence. Be sure to measure as accurately as possible at a 1:1 ratio by volume. Product temperature, surface temperature, and work space temperature is too low during the curing process. Liquidy Split should be used in an environment of 75F+ throughout the entire curing process (24hrs) to ensure it cures hard and thoroughly.