Having a tacky finish or a spot that doesn’t seem to be cured generally is a result of one of the following two reasons: 1.) Either the ratio of materials used in Part A and Part B were not equal by volume (1:1 ratio) or 2.) The product did not reach 90 °F during the mixing process (which generally occurs around the 12 minute mark).
There are two types of “un-cured” epoxy:
• Slightly tacky equates to situations where you can push in and leave a soft finger print on the surface of the Glaze Coat finish, or it feels pliable/soft instead of hard. In this case, a fresh coat may be applied over top of the slightly tacky finish to resolve the issue. Ensure the ratio of Part A and Part B are equal (by volume). Then make sure to mix the product to 90 °F before pouring over the tacky surface (generally 12 minutes of mixing). This next pour will re-activate the tacky surface and cure to a smooth, clear, and hard surface.
• Wet tacky will "string up" when you touch it and pull your fingers away or it may present as totally liquefied. Wet tacky must be removed by cutting or scrapping it out or off of the surface. Scrape until a firmer surface is reached. Mix Glaze Coat as directed and apply a new layer.