My customer has a 5 year old deck that was coated two times since being built with semi transparent flood siding stain. They are not happy with the color nor how quickly the deck faded. The deck still has a lot of stain on it but is not uniform because its shaded on half and exposed on the other half. Basically I want to know; A. Do I have to strip all the stain before recoating to achieve a uniform coat, B. will the stain strip off especially in the areas where it is still In good shape. I've stained plenty of decks but either used the same product it previously had, or stained new, and stained old decks where stain was basically gone. Just never been faced with restaining an already decent looking deck and wondering what my options are and peoples input. Any help is greatly appreciated.