No primers do not need to be applied perfectly you can always sand the excess and imperfections of primer application after it dries out.
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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...