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You should always use a primer before painting over wallpaper to help the paint adhere correctly and get a good finish. Not all wallpaper can be painted over, so do a test patch in an inconspicuous area before painting an entire wall. If the primer and paint don’t adhere, you’ll need to remove the wallpaper, prime the wall, and then paint.

You can wallpaper and paint over certain types of wallpaper, but it’s usually a better idea to remove it first. Removing the wallpaper and prepping the wall before painting is a good way to guarantee a smooth finish that looks professional. If you ever have a moisture or water issue after painting over wallpaper, the paper will bubble and damage your wall. Additionally, you should never paint over wallpaper already peeling or otherwise damaged, as this will leave obvious imperfections in your wall and could lead to additional problems.

A finishing layer is an important step in the staining process. A top coat helps make a stain last longer by protecting it from spills, scratches, and natural weathering.

A lacquer finish is thin, fast-drying, and best used for cabinets, molding, and trim. It’s not recommended for outdoor furniture. Another option is varnish, which has a glossy finish with a protective film and is often used on outdoor wood objects. Polyurethane, known as “liquid plastic,” dries quickly but doesn’t hold up well in the heat. Lastly, a shellac finish adds a warm tint to wood but is affected by heat.

First off, take a breath. The good news is that interior paint, especially when used outside, won’t harm your health. The bad news is that you’re going to have to reapply the proper exterior paint at some point in the not-so-distant future. Otherwise the current coat will chip, crack, and fade, or worse, develop mold or an insect infestation without remediation.