Reply by trophy

With your unheated garage and low temperature you will need to move the items into a warm DRY area for the finish to cure properly. Dampness, as well as temperature are also big no no’s with shellac as it will not cure properly and will remain gummy. Your projects are very nice and will look great once you resolve the shellac curing problem which in my opinion is environmental. You still have ample time to refinish them, jmos is correct with using the alcohol to remove the shellac as a starting place. Good Luck and Merry Christmas

-- Bruce, Upstate New York