I haven't used Solarez, but I have had the same problem with Loon UV resin. That said, what are you using for a light source? I just picked up a better quality UV lamp this past week and it makes a world of difference. Specifically, I found in the past that the outside was mostly hard, but still had a bit of tackiness to it and the underside of the resin didn't seem fully cured. Now the tackiness is gone and the resin seems hard all the way through. I need to see how the new flies actually perform, but its something to keep in mind.