Outdoor furniture is susceptible to damage from the elements, so it’s important to properly waterproof it for longevity. With the right products and techniques, you can protect patio furniture, deck chairs, tables, and more from the rain, sun, and humidity. Follow these steps to effectively waterproof and weatherproof your outdoor furniture.
Clean the Furniture Thoroughly
Before applying any waterproofing treatment, make sure the furniture is completely clean. Use a hose or power washer to remove built-up dirt, grime, mildew, and mold. Pay close attention to crevices and joints where moisture can collect. Allow the furniture to dry completely before moving on.
Sand Down Surfaces
For wood furniture, sand away any splinters, rough patches, cracks, or peeled paint and varnish. This allows the protective coating to adhere better. Wipe away all sanding dust with a dry cloth. For metal furniture, use a wire brush to remove rust spots before painting or sealing.
Apply Paint, Stain, or Varnish
These coatings provide a protective barrier against moisture on wood, wicker, and metal. For best results on wood:
- Use exterior-grade paint, stain, sealer, or varnish recommended for outdoor use. Oil-based products provide the most water protection.
- Apply 2-3 thin coats and allow thorough drying between coats.
- Cover all surfaces – front, back, legs, undersides, and crevices. Pay special attention to end grains, which absorb more moisture.
- Lightly sand between coats for maximum adhesion.
Use Water Repellent Sprays
Special sprays add an invisible water-resistant coating on wood, fabric, wicker, and metal. Common recommendations include:
- Scotchgard – Repels both water and stains. Also protects against UV damage.
- Thompson’s WaterSeal – Provides long-lasting water protection on wood and concrete.
- 303 Aerospace Protectant – Guards against fading, mildew, and stains on fabric cushions.
Re-apply as directed, usually every 1-2 months. Test first on an inconspicuous area to ensure the spray doesn’t discolor or damage the furniture.
Try Waterproofing Sealants
Products like epoxies, varnishes, and polyurethanes completely seal surfaces to block moisture absorption. Consider using:
- Marine epoxy – Forms a plastic-like, waterproof finish on wood. Ideal for boat furniture.
- Spar varnish – Specially formulated for outdoor use on wood. Resists UV rays.
- Polyurethane – Water-based versions are safe for outdoor use on wood.
Apply up to 4 coats, following label directions carefully. Ensure proper ventilation while applying.
Use Water-Repellent Cushions
Outdoor fabric cushion covers should be constructed from solution-dyed acrylic, olefin, or vinyl materials. Check the product tag to confirm. Other tips for cushions:
- Select foam cores rated for outdoor use and wet conditions. Avoid regular polyurethane foam.
- Wrap foam in a plastic moisture barrier before inserting into the cover.
- Choose covers with zippers, not ties, to keep moisture out.
- Remove cushions when not in use and store indoors.
Consider Comprehensive Sealers
All-in-one waterproofing products simplify the process with one-step application:
- Minwax Polycrylic – Protects outdoor wood against moisture, UV rays, mildew, and abrasion.
- Rust-Oleum NeverWet – Applies a superhydrophobic barrier repelling water on metal, wood, masonry and more.
- Thompson’s WaterSeal Advanced – Combines waterproofing resins and polymers for extreme water repellency on multiple surfaces.
Carefully read labels to ensure appropriateness for your particular furniture material.
Maintain Drainage Under Furniture
Pool excess water away from furniture legs using bricks, pebbles, or gravel. Raise pieces up on wood blocks or feet to prevent standing water. Check furniture after rains to wipe away any moisture. Keep patio and deck surfaces swept clean and free of leaves or debris.
Check for Reapplication Needs
Inspect outdoor furniture periodically, especially after heavy rainstorms. Look for any signs of swelling, discoloration, mold or mildew growth, leaks through joints, etc. Sand away cracked finishes and re-coat using the steps above. For maximum effectiveness, reapply waterproofing treatments at least once per year.
Proper waterproofing allows you to enjoy stylish outdoor living spaces without worrying about weather damage. With routine maintenance and reapplication, your patio furniture can provide lasting performance for many seasons. Implement these tips so you can relax on your deck comfortably whatever the forecast.