Never try to paint over an existing wood surface without first prepping it.
Applying a fresh coat of paint directly over the old one will not work and will ultimately peel. Stripping old paint before applying a new one will give you better results.
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Most stain is applied with a brush, a roller, or spraying. The manufacturer's instructions will advise the best method to suit your chosen stain.
Your wood must be clean and dry. That means all dirt and residual paint should be removed by washing and scraping. If you want a smoother surface, you can sand the wood, which helps remove dirt and...
