If this is possible without unscrewing the decking boards then yes, this should have been done before the installation of the decking boards. But, if your restoring a decking project then you could unscrew the boards and oil the underneath. This will preserve them more making them last longer....
features Abodo® Vulcan Decking finished with Abodo Protector Oil which uses the latest in waterborne oil technology combining refined plant oils, UV protection, advanced water barrier composition and an enhanced fungicidal package for superior exterior performance. Vulcan Decking is created from ...
oil, it's often used in stains to preserve its natural texture. Staining wood and other surfaces can be a brilliant way to integrate furniture into a room better. A great coat of wood stain or wood dye on your wood can dramatically improve its appearance and will bring out the beauty of...