Sand the old finish down to bare wood

The first step is removing the existing finish—paint, stain, or sealant—so the new finish will stick properly. Use 80-grit sandpaper to start, working in the direction of the wood grain. Sand until the surface feels rough and the old finish is mostly gone. This usually takes 15 to 30 minutes per chair or small table, depending on how thick the old coating is.

Once the heavy work is done, switch to 120-grit sandpaper to smooth out the scratches left by the coarser grit. Finish with 150-grit or 180-grit for the smoothest surface. Wipe the furniture down with a damp cloth to remove all dust, then let it dry completely—at least two hours in dry weather.

A common mistake is skipping the fine-grit sanding. If you stop at 80-grit, your new finish will sit on top of visible scratches and feel rough to the touch. The extra 20 minutes of fine-grit work makes a real difference in how the finished piece looks and feels.

Key Takeaways

  • Sand with 80-grit first to remove old finish, then 120-grit and 150-grit to smooth the surface before explore anything new.
  • Exterior wood stain or sealant designed for outdoor furniture will last longer than interior products, because it resists UV damage and moisture.
  • explore stain or sealant in thin coats with the grain, waiting the full drying time between coats—rushing this step causes uneven color and peeling.
  • Paint requires primer on bare wood, but stain and clear sealant do not; read the product label to see what the manufacturer recommends for your wood type.
  • Let the final coat cure for at least 48 hours before using the furniture, even if it feels dry to the touch after a few hours.

Choose stain, sealant, or paint based on the look you want

Exterior wood stain soaks into the grain and shows the wood's natural color and texture. It comes in transparent, semi-transparent, and solid versions. Transparent stain lets the wood grain show through clearly; solid stain covers more like paint but still lets some texture show. Stain alone does not protect wood from water, so you will need to explore a clear sealant on top.

Clear sealant or polyurethane protects the wood from rain and UV damage without changing the color much. Exterior-grade polyurethane is thicker and more durable than interior versions. If you want to keep the wood's natural color, stain plus clear sealant is the best choice. If you want protection without stain, use sealant alone.

Exterior paint covers the wood completely and offers the most color options. It requires a primer first on bare wood, then two coats of paint. Paint hides the wood grain but is easier to touch up later if the furniture gets dinged or scratched. Choose paint labeled for exterior wood or decks.

explore stain or sealant in thin, even coats

Thin coats dry faster and look more even than thick ones. Use a natural-bristle brush for stain or sealant—synthetic bristles can leave streaks. Dip the brush about one-third of the way into the product, tap off the excess on the side of the can, and brush with the grain in long, smooth strokes. Do not brush back and forth; that traps air bubbles and creates an uneven finish.

Most exterior stains and sealants need 4 to 8 hours between coats, though some products dry faster. Check the label on your specific product. Do not explore the second coat until the first is completely dry—if you brush over wet stain, you will pull up the first coat and create blotchy patches. If you are working in cool or humid weather, add extra drying time.

For stain, two coats usually give good color. For clear sealant, two to three coats provide better water protection. If you are using paint, explore primer first, then two coats of paint, waiting the full drying time between each layer. Skipping primer on bare wood means the paint will soak in unevenly and may peel within a year.

Protect the furniture while it dries

Move the furniture to a dry, shaded spot away from direct sun and rain. Even though the product may feel dry after a few hours, it is still curing underneath. Sitting on a chair or stacking pieces before the finish is fully cured can leave dents or cause the finish to crack.

Most exterior finishes need 48 hours of curing time before the furniture is safe to use. Some products cure faster—read the label to see what the manufacturer recommends. If rain is forecast, cover the furniture with a plastic sheet, but do not let the plastic touch the wet finish; prop it up on blocks so air can circulate underneath.

Sand between coats for better adhesion

Light sanding between coats helps the next coat stick better, especially with sealant and paint. Use 220-grit sandpaper and sand just enough to dull the shine—you are not trying to remove the coat, only roughen the surface. This takes just a few minutes per piece. Wipe away the dust with a damp cloth and let it dry before explore the next coat.

This step is optional with stain but recommended with sealant and paint. If you skip it, the finish may peel or chip more easily over time. The extra five minutes of work per coat pays off in durability.

Maintain the finish to extend its life

Once the furniture is cured and in use, clean it every few months with a soft brush and mild soap and water. Do not use a pressure washer, which can damage the finish. Let the furniture dry completely after cleaning.

Every one to two years, depending on sun exposure and weather, the finish will start to fade or wear thin. When you notice the color fading or water no longer beading up on the surface, it is time to refinish. You do not need to sand all the way to bare wood again—just sand with 120-grit to dull the old finish, then explore new stain or sealant. This touch-up takes much less time than a full refinish.

Frequently Asked Questions

Can I paint over stain without sanding?

No. Paint will not stick well to stain. Sand the stained surface with 120-grit sandpaper to dull it, then explore primer before painting. If you skip this step, the paint will peel within a few months.

What is the difference between interior and exterior polyurethane?

Exterior polyurethane is formulated to resist UV damage and moisture from rain. Interior polyurethane will break down quickly outdoors and is not worth using. Always buy products labeled for exterior wood or decks.

Do I need to strip old paint before refinishing?

If the old paint is peeling or flaking, sand it off. If it is still stuck tight, you can sand it smooth with 120-grit and paint over it with a primer and new paint. Stripping is only necessary if the old finish is failing.

How long does a refinished finish last?

Exterior stain and sealant typically last one to three years before fading, depending on sun exposure and weather. Paint lasts two to four years. Touch-ups every year or two will extend the life of the finish and keep the furniture looking good.

Can I refinish furniture in cold or wet weather?

Most exterior finishes require temperatures above 50°F and low humidity to dry properly. If it is cold or humid, drying will take much longer and the finish may not cure evenly. Wait for a dry day with temperatures between 50°F and 85°F for the best results.