Staining a Deck

definitely, especially after a few years. probably an 80 grit if you want to really flatten it.finish with a 100 grit or 120. stain it on a cloudy day. don't let it dry too fast. make sure it is really dry before u sand.

Staining a deck has a best practice process. Based on the specifics mentioned by you. "Pressure treated wood never stained". The first stage involves the preparation: - Power washing, - Wood cleaning scrub, -Rinse with water to remove the wood cleaner. Sanding: -It is recommended to touch up the deck with sanding to remove splinters and imperfections cause by weather. This part of the process ensures the look of your deck is flat and brand new, but also to prevent unprotect areas due missing staining where does damages might be. Second stage is staining: -Once the sanding and cleaning is properly done and dry for at least 24 hours, the fibers of the wood will allow the product to penetrate properly which will allow your stain not only to stain, but protect your wood properly and last for longer years as the product gets absorbed better by the wood itself. We don't recommend to cut corners in this process as it ensures the staining to last longer.

Depends on the condition of the wood.

No

It really depends on the wood

Yes, it would need to be sanded prior to stain. High and low level of sanding depends on condition of wood. And also depends what kind of stained you would like to use. Different types of stains are available transparent stain, semi transparent stain, solid stain, semi solid stain.

If it it new it will need to season and dry to a light grey allowing preservative to penetrate and dry. Pressure wash trying not to lift the grain. 24 hour dry 20c. Sand it for best finish adhesion, consistent colouring and smoothness.