Waterproofing outdoor surfaces and furniture is essential to protect them from moisture, prevent damage, and ensure longevity. Whether dealing with wooden furniture, concrete, or outdoor fabrics, the right materials and methods will keep your outdoor areas looking great for years.
Below is a detailed guide on how to waterproof different outdoor items. It focuses on practical steps, materials, and tips to make the process as straightforward as possible.
Let’s get straight to the point.
To waterproof outdoor items, clean and sand surfaces before applying products like sealants, oils, or waterproof sprays. For wood, use primers, natural oils, or sealants like polyurethane; reapply yearly.
Outdoor fabrics can be protected with waterproofing sprays. Always follow drying times, apply multiple coats for better protection, and reapply as needed to maintain waterproofing.
Avoid extreme weather during the process. Regular maintenance ensures long-lasting protection against moisture and UV damage.
Materials You Will Need For Waterproofing Outdoors
- Sealants (Polyurethane, Varnish, Lacquer) create a protective, waterproof layer over surfaces. They are commonly used on wood, metal, or stone to prevent moisture damage.
- Natural Oils (Tung Oil, Linseed Oil, Walnut Oil): Penetrate wood, enhancing its appearance while providing internal waterproofing. They are ideal for preserving natural wood.
- Sandpaper (Various Grits): Smoothens surfaces before applying treatments. Ensures better adhesion and an even finish.
- Cleaning Brushes are used to scrub off dirt or debris before waterproofing. This ensures the surface is clean for better product application.
- Waterproofing Sprays (e.g., Scotchgard): These can be applied to fabrics for quick waterproofing. They provide an invisible barrier that repels water and stains.
- Primer for Wood: Fills pores to prepare untreated wood for oils or sealants, ensuring even absorption and long-lasting protection.
- Turpentine and Vinegar (for oil mixtures): Turpentine thins oils for deeper penetration; vinegar cleans surfaces. Both enhance oil-based waterproofing applications.
- Paintbrushes: Used to apply sealants and oils. Ensures an even and smooth application on various surfaces.
- Rags or cloths are used to wipe off excess products or apply oils. They are also essential for cleaning during the waterproofing process.
- Steel Wool: Used for fine sanding between coats. Helps smooth surfaces without removing too much finish.
- Water-repellent preservatives (for untreated wood) penetrate untreated wood to prevent water absorption and decay. They are used on outdoor wood structures like decks and fences.
Waterproofing Painted Wood Outdoor Furniture
Step 1: Clean The Wood Surface
Start by cleaning the furniture with a mixture of water and detergent. Scrub the surface using a brush to remove dirt, grime, and old finish.
Step 2: Sand The Surface
Use medium-grit sandpaper to smooth the wood and remove any imperfections. Follow up with finer-grit sandpaper to prepare the surface for sealing.
Step 3: Apply Primer
Apply a primer specifically designed for wood surfaces. This will enhance the longevity of the waterproof finish and improve the wood’s resistance to moisture.
Step 4: Apply Sealant
Choose a suitable sealant, such as polyurethane, varnish, or lacquer. Apply a thin coat evenly with a paintbrush. Allow it to dry according to the manufacturer’s instructions, usually 24–48 hours.
Step 5: Apply Additional Coats
For best results, apply two to three more coats of sealant, allowing each coat to dry before applying the next. Sand lightly between coats for a smooth finish.
Tips
- Always follow the drying times recommended on the product.
- Use outdoor-specific sealants for better UV protection and moisture resistance.
Waterproofing Outdoor Fabrics
Step 1: Choose A Waterproofing Spray
Use a heavy-duty waterproofing spray for outdoor fabrics like pillows. It is easy to apply and creates a moisture barrier.
Step 2: Prepare The Fabric
Ensure that the fabric is clean and dry before applying the spray. Shake the can well and test it on a small area to ensure it doesn’t alter the fabric’s colour.
Step 3: Apply The Spray
Hold the spray can about 15–20 cm away from the pillow and apply an even coat. Make sure you cover all surfaces. Let it dry for a few hours before applying a second coat.
Step 4: Let It Dry
Allow the pillows to dry for at least 24 hours before exposing them to the elements.
Tips
- Reapply the spray every season to maintain waterproofing.
- Always apply the spray in a well-ventilated area.
Sealing Concrete To Make It Waterproof
Step 1: Clean The Concrete Surface
Before sealing, the concrete must be clean and free from debris. Use a concrete cleaner or a pressure washer to remove dirt, grease, or stains.
Step 2: Select A Concrete Sealer
Choose a penetrating, impregnating sealer designed for concrete. This type of sealer creates a hydrophobic barrier, preventing water from entering the concrete.
Step 3: Apply The Sealer
Apply the sealer evenly with a roller or a sprayer. Make sure to cover all areas, especially cracks and seams. Allow it to dry for the recommended time, usually 24 hours.
Step 4: Apply A Second Coat
Apply a second coat of sealer for optimal protection. Let it dry completely before using the concrete surface.
Tips
- Avoid applying the sealer in extremely hot or cold weather for best results.
- Always follow the product’s instructions for curing times.
Waterproofing Untreated Wood Outdoors
Step 1: Sand The Wood
Untreated wood must be properly sanded to ensure the waterproofing material adheres well. Start with coarse sandpaper to remove rough areas, then use fine sandpaper for a smooth finish.
Step 2: Apply A Water-Repellent Preservative
Use a water-repellent preservative designed for untreated wood. These products protect the wood from moisture, UV rays, and mildew.
Step 3: Apply Sealant Or Oil
After the preservative dries, apply a sealant or natural oil. Natural oils like tung or linseed oil are excellent choices for untreated wood. They penetrate deep into the wood and offer long-lasting protection.
Step 4: Let The Wood Dry
After each coat, allow the wood to dry thoroughly. This process may take a day or more, depending on the weather conditions.
Tips
- Reapply the preservative every year to maintain waterproofing.
- Ensure that the wood is dry before applying any product.
Waterproofing A Wooden Outdoor Table
Step 1: Sand The Table
Smooth the table surface using sandpaper. This ensures the waterproofing material penetrates the wood evenly.
Step 2: Apply The First Coat Of Oil Or Sealant
Choose a natural linseed or tung oil for a natural finish, or use a sealant like polyurethane for maximum protection. Apply the oil or sealant with a cloth or paintbrush, ensuring even coverage.
Step 3: Let It Dry
Allow the first coat to dry for at least 24 hours. If using oil, let it soak in properly before applying another coat.
Step 4: Apply Additional Coats
Depending on the wood’s absorption rate, apply two or more coats. Each coat should dry completely before the next one is applied.
Tips
- Mix tung or linseed oil with turpentine for better absorption.
- Sand lightly between coats for a smoother finish.
Using Natural Oils To Waterproof Wood
Step 1: Choose The Right Oil
Natural oils like tung, linseed, or walnut oil are commonly used to waterproof wood. Tung oil is more durable but slightly more expensive, while linseed oil is easier to find.
Step 2: Mix The Oil With Turpentine And Vinegar
Mix the oil with a small amount of turpentine and apple cider vinegar for better results. This mixture helps the oil penetrate deeper and offers longer-lasting protection.
Step 3: Apply The Oil
Apply the oil mixture to the wood with a cloth or brush. Rub it in thoroughly, ensuring that all areas are covered.
Step 4: Allow It To Dry
After applying the oil, let it dry for a day or two. Repeat the process two to three times, allowing the wood to absorb the oil fully.
Tips
- Sand the wood between coats for a smoother finish.
- Wait a few weeks after the final coat before using the furniture.
Conclusion
Waterproofing outdoor surfaces and furniture is critical to preserving longevity and aesthetic appeal.
Whether you’re protecting wood, concrete, or fabrics, the right techniques and products will keep your outdoor spaces looking their best while shielding them from moisture, UV rays, and other environmental factors. With regular maintenance using appropriate sealants, oils, and sprays, your outdoor items will remain durable and beautiful for years to come.
Follow the recommended application and drying processes, and reapply treatments as needed to ensure ongoing protection. Proper care now means less hassle and expense later, allowing you to enjoy your outdoor spaces season after season.
FAQs About Waterproofing
Why Is Waterproofing Outdoor Spaces And Furniture Important?
Waterproofing is crucial because it helps prevent moisture from penetrating materials, which can lead to mould, mildew, rot, and structural damage. Without proper waterproofing, outdoor furniture, decks, and other structures can degrade over time due to continuous exposure to water, rain, and humidity.
How Often Do I Need To Reapply Waterproofing Products?
The frequency of reapplication depends on the type of waterproofing product used and environmental exposure. In general:
- Wood sealers may need to be reapplied every 1-3 years.
- Fabric sprays usually require reapplication annually or after heavy rain seasons.
- Rust-proof coatings on metal furniture should be checked annually and touched up as needed.
Regular inspections of waterproofed items can help determine when reapplication is necessary.
Can Waterproofing Sprays Be Used On All Types Of Outdoor Fabrics?
Waterproofing sprays are generally safe for most outdoor fabrics, but it’s always recommended to check the manufacturer’s guidelines.
Delicate or treated fabrics may require specific types of waterproofing sprays. It’s also a good idea to test the spray on a small, inconspicuous area before applying it to the entire surface.
How Do You Protect Untreated Wood Outdoors?
The only way to properly use untreated wood outside is to add water-repellent preservatives, sealers, or paint that contains UV protection.
Over-the-counter wood preservatives are available in clear versions or with a stain containing pigment or dye to colour the wood.
Can I Waterproof Outdoor Items Myself, Or Should I Hire A Professional?
Many waterproofing tasks can be done using commercially available products like wood sealers, waterproof sprays, and membranes.
However, hiring a professional may ensure the job is done correctly and more efficiently if you waterproof large structures such as decks or patios or if the area has severe water damage.
