Best Deck Stain for Composite Decking? 5/5 (1)

This post was updated on March 23, 2025

Best Deck Stain for Composite Decking

While most composite decking is marketed as low-maintenance, older composite decks—especially those made from wood-plastic blends—can fade, stain, or grow mildew over time. When this happens, applying a deck stain can restore appearance and add protection. The best option for composite decking is a high-quality semi-solid penetrating stain.

Top Pick: TWP Semi-Solid Pro-Series Deck Stain

The TWP Semi-Solid Pro-Series is our top choice for composite decks. Here’s why:

• Excellent Penetration – Unlike solid stains or sealers that tend to peel on composite surfaces, the TWP semi-solid penetrates into the wood-plastic material, helping it last longer with fewer maintenance issues.
• Enhanced UV Protection – The higher pigment load shields against fading and sun damage.
• Moisture Resistance – Helps seal the deck surface to prevent mold, mildew, and water damage.
• Rich, Natural Look – Offers beautiful semi-solid tones that still show some wood grain while covering imperfections.

How to Stain a Composite Deck (Properly and Safely)

If your composite deck is starting to look faded, moldy, or worn, staining can revive its appearance and add much-needed protection. Older composite decks—especially those made from wood-plastic blends—can benefit from a good cleaning and the right type of penetrating stain. Follow these steps to get long-lasting results.

Step 1: Clean the Deck Thoroughly

Before applying any stain, you need a clean, dry surface to ensure proper penetration and adhesion.

✔ Use a composite deck cleaner to remove dirt, mildew, algae, and gray weathering.
✔ Scrub with a stiff-bristle brush or use a pressure washer on a low setting (under 1500 PSI).
✔ Focus on mildew removal, as older composite decks often harbor mold due to their wood fibers.
✔ Allow the deck to dry completely—this can take 24–48 hours depending on conditions.

Pro Tip: Never stain over damp composite decking—it will trap moisture and lead to early stain failure.

Step 2: Choose the Right Composite Deck Stain

Not all stains are suitable for composite materials. Select a high-quality, penetrating stain designed to work on wood-plastic composites.

✔ Choose a semi-transparent or semi-solid penetrating stain—avoid solid or film-forming products.
✔ Look for formulas that contain mildewcides or zinc-based additives to prevent mold and mildew regrowth.
✔ A good stain will resist UV fading, discoloration, and water absorption.

We recommend TWP Semi-Solid Pro-Series for composite decking due to its excellent penetration, color retention, and mildew resistance.

Step 3: Apply the Stain the Right Way

Proper application makes all the difference in durability and appearance.

✔ Use a stain pad, brush, or roller to apply evenly and push the stain into the surface.
✔ Work in small sections and follow the grain of the decking when possible.
✔ Avoid over-applying—too much stain can cause pooling, tacky spots, or uneven color.
✔ Allow the stain to penetrate for a few minutes, then wipe away any excess.

Avoid using film-forming stains—they don’t adhere well to composite and tend to peel, trap moisture, and encourage mildew.

Why Not Use Solid Stains on Composite?

Solid color stains may seem appealing for coverage but often fail on composite decking due to poor adhesion. These stains typically form a film that sits on the surface and peels quickly under foot traffic or exposure to the elements.

Final Tips

• Clean the deck thoroughly with a composite-safe cleaner before staining.
• Allow proper dry time—composite can retain moisture longer than natural wood.
• Always test a small hidden section first for adhesion and appearance.

More information on deck stains for composite decks

• Best Stain for Composite Decks – What to use?
• Composite Sealer Reviews
• TWP Semi-Solid Pro-Series Wood and Deck Stain Review

Scott Paul ~ Restoring Wood & Decks Since 1993 Owner

As an article and comment contributor to the site, Scott has been around the pressure washing industry since attending college. In 1993 he started his first company called Oakland Pressure Wash specializing in exterior pressure washing and deck staining. That company evolved into OPW L.L.C. shortly thereafter concentrating more on exterior wood and deck restoration. Scott and his Deck Cleaning Michigan company have restored over 10,000 decks in the Metro Detroit area since the early years. He has become an authority in the deck restoration industry and has contributed to numerous wood restoration forums and informative sites. All the products he suggests through this site are sold through online sites and in retail stores, allowing the consumer to choose their own means of purchase. Scott’s eCommerce sites do sell many top brands he endorses and if you appreciate any of the help he has offered then feel free to purchase from one of them.

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