Sealing pressure treated wood is technically possible, but it is not a recommended practice. The chemicals used in pressure treating are designed to already provide a level of protection against moisture and decay. Adding a sealant on top of these chemicals may not allow the wood to breathe properly, potentially trapping moisture and causing issues such as warping, cracking, or peeling.
If you are determined to seal pressure treated wood, keep in mind that it will need to be applied after a waiting period similar to staining. Consult the sealant manufacturer’s instructions for the ideal timing.
In summary, staining pressure treated wood is a viable option to enhance its appearance while maintaining its durability. However, it is crucial to allow the wood to dry properly before staining and to follow the recommended preparation and application techniques. On the other hand, sealing pressure treated wood is generally not recommended due to potential issues with moisture trapping. Always consult the manufacturer’s guidelines for specific products and take necessary safety precautions, such as working in a well-ventilated area and wearing protective gear, when staining or sealing pressure treated wood.