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1. First strip off any sealers, wax coats or other protective finishes on the current surfaces, you cannot restain them… you will need to strip them down to bare wood first.. secondly you cannot use red stain over brown stain… you'll get a mixed blotchy result… so in short to achieve your goal, you need to strip it all off first… then use the red stain…

   HINT: consider priming it with an oil base primer and then paint it with exterior grade, high quality red paint… either flat, semi, satin or gloss sheen…

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2. When staining over a brown surface with red stain, the original brown color will affect the outcome of the red stain. Red stain tends to be transparent, meaning that the underlying brown will influence the final color. To ensure the desired red hue, it is recommended to choose a solid color acrylic stain, this will have more pigment that semi-transparent.

   First, wash with a pressure washer to remove the existing brown stain that is loose or peeling. This will also remove any oxidized stain. This will allow the red stain to fully showcase its intended color without interference from the brown beneath it. Additionally, it could take more than 1 coat to get the proper color.

   Ultimately, the final appearance of the red stain over the brown will depend on factors such as the type of stain used, the thoroughness of preparation, and the desired intensity of the red hue. By properly preparing the surface and selecting the right products, you can successfully achieve a red-stained barn/garage that meets your aesthetic preferences.

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