I have been using epoxy resin on a deck replacement and other repairs. When I do lamination or mix it with filler I have no problem with it curing to a tack free surface within 24 hours but when I brush or roll on just pure resin over the cured lamination or bare wood it will not cure tack free even after several days. The temperature has been 70 to 80 during the day and 50's at night under the cover. Any ideas where I am going wrong.