First, to remove mildew spores, scrub affected surfaces with a combination of 1L household bleach and 3L water. The Wood needs to be dry; when the stain is applied to wet surfaces, it does not adhere well and will crack or peels.
Premature wood rot and decay can be caused by moisture. So, before staining the wood, make sure it’s completely dry. Look for any holes, cracks, splits, or loose joints that require attention; use wood filler to fill the gaps in the wood.
It’s always best to finish these before sanding your wood project. Sand external wood surfaces following the grain once the surface is clean and dry; brush the whole surface to remove any sanding residue. Sanding is an important part of the wood preparation process. It removes minor nicks and scratches, smooths out the dried wood filler, and opens the wood’s pores to accept more stain.
Sanding also removes the surface glaze formed when the factory’s planer blades come into contact with the natural resins in the wood. This glaze, if left un-sanded, can prevent the stain or finish from penetrating the pores. After sanding, the wood can be stained. Pay attention you use wood fillers that are stainable.
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