I have coated with solvent free epoxy and its still tacky after 3 days! Whats wrong?
Having metered and mixed the resin and hardener correctly and used it at a reasonable temperature then the only explanation is surface by-product, which can be a tacky one. The surface will feel less tacky on dry days than wet ones as moisture in the atmosphere will be attracted to the surface. The by-product is easily removed by either wet sanding or wiping with a wet cloth or Scotchbrite pad (most effective). The resin underneath will be hard and tack-free and can be relatively easily sanded.
