This can be caused by a mixing issue. If the Component A and Component B aren't mixed well enough for long enough or if you didn't use any of Component B, this would result in a project that will not dry. If the room temp is too cold this can also hinder the drying process. To fix this issue it is recommended to scrape off the tacky material, sand smooth again if needed, and reapply Ekopel to the affected areas with a Touch Up kit.