The primary reason for sealing wood is to keep moisture out. If wood is left exposed to the elements without being sealed, it will rot. Water intrusion into wood can result in more than just fungal growth and decay. If wood freezes after absorbing water, it might crack. Water isn’t the only danger to your wood. UV rays from the sun can cause colors to fade and turn gray, and also cause wood to crack and split. One of the advantages of using a sealer on your woodworking projects is that it adds an extra layer of protection. It will hold its shape considerably better in the face of changes in the environment.
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