Preparing an Old Deck for Painting: Step-by-Step Guide

Decks endure constant exposure to harsh environmental elements: sunlight, moisture, foot traffic, and temperature changes. Over time, this exposure can lead to fading, cracking, and splintering. However, deck painting is an excellent way to restore and protect your wooden surfaces while adding visual appeal to your outdoor area.

If you’re considering reviving your weathered deck, it’s essential to understand that preparation is key. Painting over an old, damaged deck without proper prep work will result in poor adhesion, uneven coverage, and a finish that deteriorates prematurely. That’s why we’ve compiled this comprehensive, step-by-step guide to walk you through the deck preparation process for flawless results.

With high-performance products from Excelsior Paints, one of South Africa’s top suppliers of solvent-based and water-based exterior wood coatings, you can ensure your deck looks great and stays protected for years to come.

Step 1: Inspect Your Deck Thoroughly

Before you pick up a brush, inspect your deck for the following:

• Rot or Mould: Use a screwdriver to probe suspect areas. Rotted wood will feel soft or spongy.

• Loose or Protruding Nails/Screws: These pose a safety hazard and need to be hammered down or replaced.

• Cracks and Splinters: Identify boards that need sanding, sealing, or replacing.

• Peeling or Flaking Paint: Existing coatings must be removed before painting.

  
  

Document what needs attention and gather all  necessary tools or replacement materials.

Step 2: Clear the Deck and Surrounding Area

Remove all furniture, planters, grills, and décor. Trim overhanging branches or nearby plants that could interfere with your work. Cover surrounding landscaping with tarps to protect it from dust and paint splatter.

Step 3: Clean the Surface

Cleaning your deck is essential to remove dirt, mildew, algae, and old paint residue. Here’s how:

Tools and Supplies

• Deck cleaner or wood cleaner

• Stiff-bristled brush or deck scrubber

• Pressure washer (optional)

• Safety gear (gloves, eye protection)

  
  

Method

• Apply deck cleaner according to the product instructions.

• Scrub thoroughly using your brush to loosen grime, especially in corners and between boards.

• Rinse thoroughly with a garden hose or pressure washer on a low setting to avoid damaging the wood.

• Let the deck dry completely, ideally for 24 to 48 hours.

  
  

Step 4: Remove Loose Paint and Sand the Surface

For decks with peeling paint or rough areas, sanding is essential for smooth, paint-ready surfaces.

Steps:

• Use a paint scraper to remove flaking or peeling paint.

• Sand the entire deck with 60- to 80-grit sandpaper using a belt sander or orbital sander.

• Pay special attention to edges and railings.

• Vacuum or sweep up the dust and wipe surfaces clean with a damp rag.

Tip: Avoid using extremely fine sandpaper; it may polish the wood and reduce paint adhesion.

Step 5: Repair Any Structural Damage

Replace damaged boards, fill cracks with exterior wood filler, and reinforce any wobbly rails or posts. Let all repairs and fillers cure completely before proceeding.

Step 6: Choose the Right Varnish for the Job

When painting a deck, choosing the right exterior wood varnish product is crucial. Excelsior Paints offers two primary options:

Aqua-var Exterior Gloss Varnish or Aqua-var Exterior Satin Varnish 

• Environmentally friendly and easier to clean up

• Ideal for South African Climates

• Best for decks with good airflow and less direct sun exposure

• Provides a Gloss Finish or Satin Finish

• Available in 6 different colours

  
  

Step 7: Prime the Wood (If Needed)

Some paints, especially solid-colour deck paints, may require priming to improve adhesion and coverage. Use an Excelsior Paints pink or white wood primer that’s compatible with your chosen paint.

Apply one even coat using a brush or roller and allow it to dry thoroughly.

Step 8: Apply the Deck Paint

Now the fun begins: bringing your deck back to life!

Equipment:

• Paint roller with an extension pole

• Angled brush for edges and corners

• Paint tray

• Drop cloths and painter’s tape

  
  

Tips for Application:

• Start early in the day when temperatures are moderate.

• Apply the paint in thin, even coats along the direction of the wood grain.

• Use the roller for large surfaces and the brush for railings and corners.

• Allow the first coat to dry fully (as per the manufacturer's instructions) before applying a second coat.

• Let the final coat cure for at least 48–72 hours before returning furniture or foot traffic to the area.

  
  

Step 9: Maintain Your Painted Deck

• To keep your freshly painted deck looking flawless:

• Sweep regularly to prevent the buildup of dirt and debris.

• Reapply a maintenance  coat every two to three years, depending on exposure and wear.

• Address chips or peeling promptly to avoid moisture damage.

• Inspect for signs of rot, mildew, or insect damage annually.

  
  

Benefits of Deck Painting

Using Excelsior Paints’ exterior wood products offers several key benefits:

• Superior Adhesion: Penetrates wood fibres for better grip and longevity.

• Weather Resistance: Resists peeling and cracking in high-UV, high-moisture environments.

• Quick Drying: Reduces project turnaround time.

• Low Maintenance: Offers long-term colour retention and protection.

• Professional Finish: Enhances the look of older decks, adding immediate curb appeal.

  
  

FAQs About Deck Painting

What’s the best time of year to paint a deck?

Spring and autumn are ideal. Avoid painting in extreme heat, cold, or during rainy periods.

Can I paint over an old stained deck?

Yes, but proper surface preparation, including cleaning and sanding, is essential for adhesion.

How long should I wait after cleaning before painting?

Your deck should dry completely, usually 12 to24 hours, before applying paint.

How many coats of deck paint are necessary?

Most projects require two coats for even coverage and long-term durability.

Should I use water-based or solvent-based paint?

For enhanced durability and quicker drying, solvent-based varnish like that from Excelsior Paints is ideal, especially in demanding climates.

Can I clean the deck immediately after painting?

Wait at least 14 days after the final coat to allow the varnish to cure properly.

How often should I repaint my deck?

Decks should be repainted every two to three years, depending on exposure and foot traffic.

A Beautiful Deck Starts with Proper Prep

Deck painting is more than just a cosmetic upgrade; it's a vital part of protecting your investment and enhancing your outdoor living experience. With the proper preparation, high-performance materials, and careful application, your deck can be transformed from worn and weathered to stunning and stylish.

Trust Excelsior Paints for premium solvent-based and water-based exterior wood products that provide superior coverage, weather resistance, and long-term durability. Whether you're refreshing your backyard deck or restoring a high-traffic walkway, we have the solution to help you achieve flawless, long-lasting results.

Transform your deck and your outdoor experience today.

Contact our team today for more information about our products. Alternatively, please continue to browse our website to find the paint solution for your needs or your nearest stockist.