My garage doors are rough cedar and they are not in terrible condition, so I would like to restain them while they are just beginning to need it. They receive the west sun. What preparation do I need to make before applying the new stain?

Very confused here. Have been using SW A-100 oil primer on exterior of 1897 home, top-coating with Duration. Is this compatible? Wondering if need to switch to a latex or acrylic based on some comments. Also, harsh south exposure; What is best to use as topcoat for less fading, more

I have light oak cabinets in my kitchen whose finish is either nearly worn away, or looks like new. To refinish the cabinets with a darker, reddish tint, is it necessary to strip off all of the existing finish?