To remove WaterSeal, you typically need to apply a specialized deck stripper, allow it to penetrate the old finish for a short period, and then thoroughly scrub and rinse the surface.
Understanding WaterSeal Removal
Over time, older deck sealers like WaterSeal can begin to show wear, peel, or become discolored, necessitating removal before a new finish can be applied. Properly stripping the old sealant ensures that the new product adheres well and provides a consistent, attractive look.
General Approach to Removing Old Finishes
Many deck stripping solutions are formulated to work quickly, often allowing you to apply the product and then, within minutes, begin scrubbing and rinsing away the old finish. This efficiency is crucial for tackling larger areas without letting the stripper dry out. The process involves dissolving the old finish, making it easier to lift from the wood surface.
Tackling Solid Stains
For more challenging tasks, such as removing stubborn residues or solid stains that have deeply penetrated the wood, a heavy-duty product is essential. In such cases, a potent solution like Thompson's® WaterSeal® Maximum Strength Deck Stripper is specifically designed for effective removal. These maximum strength strippers contain stronger chemicals formulated to break down resilient finishes and deeply embedded stains, preparing the wood for a fresh coat.
Step-by-Step Guide to Removing WaterSeal
Stripping WaterSeal is a methodical process that requires careful preparation and execution to achieve the best results and ensure safety.
Preparation is Key
Before you begin, ensure the area is ready for chemical application:
- Clear the Deck: Remove all furniture, plants, and other items from the deck surface.
- Clean the Surface: Sweep or blow off any loose debris, leaves, or dirt.
- Protect Surroundings: Cover nearby plants, shrubs, and any adjacent siding or surfaces with plastic sheeting or tarps to prevent chemical splash damage.
- Wear Safety Gear: Always use appropriate personal protective equipment (PPE), including chemical-resistant gloves, eye protection (safety glasses or goggles), and long-sleeved clothing to protect your skin. Refer to OSHA guidelines for PPE for general best practices.
Application Process
Once prepared, proceed with applying the deck stripper:
- Read Instructions: Carefully read and follow the manufacturer's instructions for the specific deck stripper you are using. This includes information on dilution ratios (if applicable), application methods, and dwell times.
- Apply Evenly: Using a pump sprayer, roller, or brush, apply the stripper evenly over a manageable section of the deck. Avoid working in direct sunlight if possible, as this can cause the product to dry too quickly.
- Allow to Dwell: Let the stripper sit on the surface for the recommended dwell time, which is typically just a few minutes, as indicated by the product label. Do not let it dry on the wood. Re-apply a light mist of water or stripper if it starts to dry.
Scrubbing and Rinsing
This is where the old finish is physically removed:
- Scrub: While the surface is still wet with the stripper, use a stiff-bristle brush (non-metallic) to scrub the wood in the direction of the grain. This helps to lift and dislodge the old finish.
- Rinse Thoroughly: Using a garden hose with a strong nozzle or a pressure washer set to a low-pressure fan setting (typically 600-1200 PSI to avoid damaging the wood), thoroughly rinse the stripped area. Start rinsing from the highest point and work your way down. Ensure all stripper residue and loosened finish are completely washed away. For more tips on cleaning, check resources like This Old House deck cleaning guide.
- Repeat if Necessary: For areas with particularly thick or stubborn finishes, you may need to repeat the application, scrubbing, and rinsing process.
Neutralization (If Required)
Some strong strippers may alter the pH of the wood, which can affect the adhesion of new finishes or cause discoloration.
- Apply a Brightener/Neutralizer: If your stripper requires it, apply a deck brightener or neutralizer after rinsing the stripper. This step helps restore the wood's natural pH and color, creating an optimal surface for new stains or sealants. Follow the product's specific instructions for application and rinsing.
Essential Tools and Materials
Having the right tools makes the WaterSeal removal process more efficient and safer.
| Tool/Material | Purpose |
|---|---|
| Deck Stripper (e.g., Thompson's® WaterSeal® Maximum Strength Deck Stripper) | To dissolve old finishes and solid stains effectively |
| Stiff-bristle brush (non-metallic) | For manual scrubbing to lift the loosened finish |
| Pressure washer (optional) | For efficient rinsing and aiding in removal of stubborn finishes (use with caution and low pressure) |
| Garden hose with spray nozzle | For thorough rinsing of chemicals and debris |
| Pump sprayer or roller/brush | For even application of the deck stripper |
| Safety glasses or goggles | Essential eye protection from chemical splashes |
| Chemical-resistant gloves | Hand protection from corrosive substances |
| Plastic sheeting/tarps | To protect surrounding vegetation, siding, and other surfaces |
| Deck cleaner/brightener | For post-stripping cleaning and wood neutralization, if needed |
| Bucket | For mixing or holding solutions |
Important Considerations
- Weather Conditions: Always plan to work on a cool, overcast day. Direct sunlight can cause strippers to evaporate too quickly, reducing their effectiveness and potentially leaving residues. Avoid working on windy days to prevent overspray.
- Test a Small Area: Before applying the stripper to the entire deck, test it on an inconspicuous small area to ensure compatibility with your wood type and to gauge its effectiveness and any potential adverse reactions.
- Proper Waste Disposal: Dispose of chemical waste and contaminated coverings according to local regulations. Never pour chemicals down storm drains.
