Old Resin

I have a touch over a gallon of gloss resin that is comming up on its first birthday and was wondering what would be the best way to take care of this resin.

Can it be saved in its old age and used on a board? and if not what is the best way to dispose of said resin?

if its too lumpy and cannot flow then add a few drops of catalyst and let it dry overnight. If its still in liquid form but has small lumps you could use it to fix dings or make fins.