Sealing the cut ends of composite decking is not necessary, but it can help improve the appearance and longevity of the deck. The exposed cut ends of composite decking can be rough or jagged, which can detract from the overall appearance of the deck. Sealing the cut ends can help smooth them out and give the deck a more finished look.
In addition, sealing the cut ends of composite decking can help prevent moisture from penetrating the board and causing damage, such as swelling or warping. Moisture can also cause the exposed cut ends to deteriorate over time, which can affect the structural integrity of the deck.
To seal the cut ends of composite decking, you can use a clear, silicone-based sealer or a decking manufacturer-approved end-cut solution. Simply apply the sealer to the cut end of the board using a brush or roller. Be sure to follow the manufacturer's instructions for the sealer and allow it to dry completely before installing the board.
Overall, while sealing the cut ends of composite decking is not necessary, it can be a good idea to help improve the appearance and longevity of your deck.