There are provided a processes for manufacturing a trim board, as well as methods for reducing and/or preventing swelling in a finger jointed pine wood and methods for reducing and/or preventing migration of tannins in a finger jointed pine wood. These processes and methods comprise applying a first layer comprising a UV curable primer sealer on a front surface of the pine wood; heat drying the first layer in the presence of UV radiation so as to at least partially cure the first layer comprising the UV curable primer sealer; applying a second layer comprising the UV curable primer sealer on a back surface of the pine wood, the second layer being thinner than the first layer; and heat drying the second layer in the presence of UV radiation so as to at least partially cure the second layer comprising the UV curable primer sealer.