The Thompson's Company Recalls Aerosol Waterproofing Wood and Masonry Protectors Due to Fire Hazard

What was recalled

In early January of 2020, a significant safety concern emerged regarding a popular line of home improvement products distributed by The Thompson’s Company. Specifically, the Consumer Product Safety Commission (CPSC) issued a recall on January 14, 2020, for certain aerosol cans of Thompson’s WaterSeal waterproofing wood and masonry protectors. This is not a broad recall of every product made by Thompson’s, but rather a targeted safety measure focusing on specific aerosol packaging that contained a manufacturing defect. If you have been using these products to seal deck boards, fence panels, or exterior masonry surfaces, it is crucial to verify whether your can falls within this specific batch.

The recalled items are distinct because of their packaging and labeling. They are 11-ounce aerosol cans designed for coating exterior wood to prevent water damage. The most immediate way to identify these products is by looking at the cap color; the affected units come with either a green or a blue cap. Beyond the cap, you must check the printed text on the can body. Look for the phrases "Thompson's WaterSeal," "Wood Protector," or "Masonry Protector." However, the most reliable method of identification is the unique Item number and UPC code printed on the label. The recall covers four specific product variations:

• Thompson’s WaterSeal Waterproofing Wood Protector Aerosol: Item # TH.041800-18, UPC 032053418006
• Thompson’s WaterSeal Signature Series Aerosol: Item # TH.091800-18, UPC 032053918001
• Thompson’s WaterSeal Waterproofer Plus Wood Protector Aerosol: Item # TH.011800-18, UPC 032053118005
• Thompson’s WaterSeal Waterproofer Plus Masonry Protector Aerosol: Item # TH.023100-18, UPC 032053231001

While the official recall notice does not specify the exact number of units distributed or the specific retail chains where they were sold, these products were widely available in hardware stores and home improvement centers across the United States. Because aerosol sealers are staple items for homeowners looking to protect their property from weathering, it is possible that many of these cans are still sitting in garages, sheds, or under sinks. If you purchased any of the items listed above with a green or blue cap prior to January 14, 2020, you should treat them as part of this recall until confirmed otherwise.

The hazard, explained

It might seem counterintuitive that a product designed to protect your home from water damage could actually create a dangerous situation inside your garage or shed. The core issue with these recalled Thompson’s WaterSeal aerosol cans lies in a subtle but serious chemical and physical reaction between the product itself and its container. These aerosol products are not just simple liquids; they are pressurized systems. Inside each can, a propellant gas works to push the waterproofing sealer out when you press the nozzle. Under normal circumstances, the metal can is strong enough to contain this pressure safely. However, in these specific units, the contents of the can have been found to react with the metal packaging.

This chemical reaction causes the steel of the can to corrode rapidly, leading to rust formation along the seam where the can was sealed during manufacturing. Rust is essentially iron oxide, and as it forms, it eats away at the structural integrity of the metal. Because the corrosion starts at the seam, it doesn’t stay there for long. The weak spots spread across other areas of the can’s surface, eventually creating tiny, almost invisible pinhole leaks. These are not large spills you would immediately notice; they are microscopic breaches in the container that allow the internal contents to escape slowly over time.

The danger escalates from a simple leak to a significant safety threat because of what is leaking. The propellant gas inside these cans is highly flammable. When it escapes through those pinhole leaks and mixes with the air, it creates an invisible cloud of vapor. If this vapor comes into contact with any common source of ignition—such as a pilot light on a water heater, sparks from an electrical outlet, or even a static discharge—the result can be a fire or an explosion. This is why the recall is classified under a fire hazard rather than just a product defect.

Beyond the immediate risk of fire, there is also the issue of property damage. The waterproofing sealer itself is a chemical substance that can stain and degrade materials it was not meant to touch. As the seal fails, the sealer can leak out onto shelves, stored items, or flooring, causing costly damage to your belongings. While the company has received reports of leaking cans from retailers, it is important to note that no injuries, fires, or property damage have been reported in connection with this specific defect so far. However, the potential for harm remains real because the failure mechanism is unpredictable. One can might hold up perfectly fine until the moment you move it or store it near a heat source, at which point the leaked propellant could ignite. Understanding that this is a latent defect—a problem waiting to happen—highlights why stopping use immediately is the only safe course of action.

Who is most at risk

While the immediate physical danger from these aerosol cans stems from a mechanical failure of the container rather than the chemical toxicity of the sealant itself, the people most likely to encounter this hazard are those who engage in routine exterior home maintenance. Specifically, homeowners and renters who use Thompson’s WaterSeal products to protect wooden decks, fences, siding, or masonry surfaces like brick patios and stone walls are the primary group at risk. These individuals typically purchase the product for seasonal upkeep, meaning they may have stored cans in garages, sheds, or basements for extended periods. The recall notice indicates that the rusting issue develops over time as the contents react with the can material. Therefore, anyone who purchased these 11-ounce aerosol cans prior to January 14, 2020, and has kept them in their home environment is potentially exposed to the risk, regardless of whether they have used the product yet.

Within this broad group of homeowners, certain demographics face heightened vulnerability due to how they interact with stored household chemicals. Children are particularly at risk because aerosol cans can resemble familiar household spray products like air fresheners or cooking sprays. If a child finds a leaking can in a garage or storage area, they may handle it out of curiosity. The recall notes that the propellant leaks create a fire hazard. If a child were to bring a leaking can near a pilot light, an electrical outlet, or another ignition source, the consequences could be severe. Furthermore, while no injuries have been reported to date, the physical act of handling a corroded, pressurized container carries a risk of sudden rupture or spray, which could cause eye injury or skin irritation in young children who are less aware of safety protocols.

Elderly individuals or those with limited mobility may also be at greater risk, not necessarily because they are more physically vulnerable to the chemicals, but due to the nature of the product’s application. Waterproofing sealers are often used by older adults maintaining their own homes independently. If an individual attempts to use a can that has begun to rust internally, the structural integrity of the can is compromised. The pressure buildup from the leaking propellant could cause the can to burst unexpectedly during use. For someone with slower reflexes or limited strength, dealing with a sudden spray of pressurized liquid and gas in their face or eyes could lead to significant harm, including respiratory distress if the fumes are inhaled in an enclosed space. Additionally, individuals living in older homes with poor ventilation in storage areas (like unventilated attics or hot garages) may accelerate the corrosion process, increasing the likelihood of a leak occurring before they realize the product is defective.

It is important to clarify who is generally not at immediate risk. The recall specifies that no injuries, fires, or property damage have been reported so far. This suggests that while the potential for harm exists, the actual incidence rate has been low relative to the number of units sold. However, “low incidence” does not mean “no risk.” The danger is latent and unpredictable. A can that looks perfectly fine on the outside may have a pinhole leak developing inside due to rust along the seam. Therefore, the most accurate assessment is that anyone who owns the specific item numbers listed in the recall—particularly those stored in warm or humid environments—is at potential risk until they dispose of the product or obtain a refund.

Ultimately, the risk is not about who you are, but what you own and where you store it. If you have any of the four affected item numbers (TH.041800-18, TH.091800-18, TH.011800-18, or TH.023100-18) in your home, regardless of your age or health status, you are part of the at-risk population until you take action. The hazard does not discriminate; it waits for a failure point in the metal can to create a flammable vapor cloud. By recognizing that this risk applies to all users of exterior wood and masonry protectors, we can move past fear and focus on the simple, effective remedy provided by the manufacturer.

How to tell if you have the recalled item

Before you take any action, it is crucial to verify that your specific can of Thompson's WaterSeal is part of this recall. Because these products are widely available at many home improvement stores and online retailers, it is easy to assume a product is safe simply because it looks familiar. However, only the specific aerosol versions listed in the Consumer Product Safety Commission (CPSC) notice are subject to this safety alert. The first thing you should do is locate the can in your garage, shed, or storage area and inspect the label carefully. You are looking for a 11-ounce aerosol can. These cans are distinct because they feature either a green cap or a blue cap. If your can has a different color cap or is a different size, it is likely not part of this specific recall, but you should still check the other details to be absolutely certain.

Next, turn the can around and look for the printed text on the side. The label must clearly state "Thompson's WaterSeal" along with either "Wood Protector" or "Masonry Protector." This is a key identifier because the recall applies specifically to these waterproofing sealers in aerosol format. Below that branding, you need to find two critical pieces of data: the Item number (often abbreviated as Item #) and the UPC code. These numbers are your definitive proof of whether your product is affected. You should compare these numbers against the specific list provided by The Thompson's Company. The recalled items include the Thompson's WaterSeal Waterproofing Wood Protector Aerosol with Item # TH.041800-18 and UPC 032053418006; the Thompson's WaterSeal Signature Series Aerosol with Item # TH.091800-18 and UPC 032053918001; the Thompson's WaterSeal Waterproofer Plus Wood Protector Aerosol with Item # TH.011800-18 and UPC 032053118005; and the Thompson's WaterSeal Waterproofer Plus Masonry Protector Aerosol with Item # TH.023100-18 and UPC 032053231001. If your can matches any of these exact item numbers and UPC codes, it is part of the recall.

If you cannot find the original packaging or have lost the receipt, do not worry. The Item number and UPC code are printed directly on the can itself, so you can identify the product without needing proof of purchase. It is important to be thorough here because the hazard involves the chemical reaction within the can's structure, which could occur regardless of when you purchased it. Once you have confirmed that your can matches one of the listed item numbers and UPC codes, you should stop using it immediately. Do not attempt to test for leaks by shaking or tilting the can, as this could potentially trigger the hazard. Instead, keep the can in a safe, well-ventilated area away from any heat sources or ignition points until you are ready to dispose of it according to local requirements.

What to do — step by step

Your refund, repair, or replacement options

One of the most common concerns when dealing with a product recall is figuring out exactly what you are entitled to and how to go about getting it. In this specific case involving The Thompson's Company, the remedy is straightforward and consumer-friendly: you are eligible for a full refund. It is important to understand upfront that there is no repair option available for these aerosol cans. Because the issue involves a chemical reaction within the pressurized container that leads to rust and potential leaks, the product cannot be safely fixed or refurbished. The only viable path to resolution is to return the item for your money back. This approach ensures that you are not left holding a potentially hazardous product while navigating complex repair logistics.

To initiate this refund process, you have several convenient contact methods at your disposal. The Thompson's Company has set up dedicated channels specifically for this recall to ensure your inquiry is handled efficiently. You can reach them by calling their toll-free number at 888-304-3769. This line is staffed and available from 9 a.m. to 5 p.m. Eastern Time, Monday through Friday. If you prefer written communication or need to provide detailed information about your purchase, you can send an email directly to thompsonsaerosolrecall@sherwin.com. Additionally, the company has established a dedicated section on their website at www.thompsonswaterseal.com. You simply need to navigate to the site and click on the “RECALL” banner to find further instructions and resources.

While the recall notice does not explicitly detail every step of the mail-in or drop-off process, the general expectation for this type of remedy is that you will follow the instructions provided by the company once you make contact. This typically involves confirming your purchase details, such as the item number and UPC code found on the can, to verify that your specific unit is part of the recall. After verification, they will guide you through the process of disposing of the product safely and issuing your refund. It is crucial to act promptly because, although no injuries or fires have been reported, the cans pose a fire hazard if they leak and come into contact with ignition sources.

When you are ready to proceed, keep your receipt or proof of purchase handy if you have it, though the recall contact information suggests that the company is equipped to handle cases where documentation might be missing. Remember, the goal here is to remove the hazard from your home and restore your peace of mind. By securing a full refund, you are not only recovering the cost of the product but also eliminating the risk of property damage or fire associated with the leaking propellant. Take the time to make that call or send that email; it is a simple step that ensures your safety and satisfies your consumer rights under this recall.

What can happen if you ignore it

It is completely understandable why you might want to keep using a product that has already been opened and is sitting in your garage or shed. You may feel that the risk is minimal, especially since the cans look intact on the outside. However, ignoring this recall carries specific, tangible risks that go beyond a simple inconvenience. The core issue with these Thompson’s WaterSeal aerosol cans is not just that they might leak; it is that the chemical reaction inside the can is progressive and unpredictable. Over time, the contents react with the metal package, causing rust to form along the seam. This rust does not stay contained. It spreads to other areas of the can, eventually creating tiny pinhole leaks that are often invisible to the naked eye until it is too late.

The most immediate danger you face by continuing to use these cans is fire. The product contains propellants designed to keep the sealer under pressure. When the can develops those microscopic pinhole leaks, this propellant escapes into the air around the nozzle or the base of the can. Propellant vapors are highly flammable. If you were to attempt to use a recalled can in a garage where there is a water heater pilot light, an electric tool running nearby, or even static electricity from walking across a carpeted floor, the leaking vapor could ignite. This does not require a large spill; a small amount of escaping gas near a source of ignition is enough to cause a flash fire. While The Thompson’s Company has currently received reports of leaks but no confirmed fires or injuries, the potential for such an event exists precisely because the integrity of the container is compromised.

Beyond the risk of fire, there is the significant threat of property damage. If you do not notice a leak until you pick up the can to use it, the sealer itself may spray out unexpectedly. This product is designed to coat wood and masonry, but it is also potent on other surfaces. Getting this waterproofing agent on your driveway, patio furniture, clothing, or inside your storage area can cause stains that are difficult or impossible to remove. More importantly, if the leak occurs while the can is stored with other flammable materials like gasoline, paint thinner, or paper products, the combination of leaking propellant and sealer creates a hazardous environment that could lead to costly cleanup efforts or damage to your belongings.

Finally, consider the reliability of the product itself. A can that is rusting internally and leaking propellant is no longer delivering the seal it promises. The pressure inside the can is dropping, which means the spray pattern will be uneven and weak. You may find yourself spending more time applying the product, using more cans than necessary, and still achieving poor coverage. By ignoring the recall, you are not only risking safety but also wasting money on a product that is failing to perform its primary function. The safest and most financially sound choice is to stop using it immediately and follow the refund instructions provided.

Staying safe: broader tips

While this specific recall addresses a manufacturing defect in aerosol cans, the underlying safety principle applies to all pressurized containers found in your home. Aerosol products, including wood sealants, cleaners, and paints, rely on propellants that are highly volatile. To prevent similar fire hazards in the future, always store these items in a cool, dry place away from direct sunlight and heat sources like water heaters, furnaces, or garages that may experience temperature extremes. Heat causes pressure to build inside the can; if that pressure exceeds the container's limit, it can lead to rupture or leakage. Proper storage is your first line of defense against both product failure and potential ignition.

Regularly inspecting the products you keep in your utility cabinet or garage is equally important. Look for signs of corrosion, rust, or swelling on any metal can, regardless of the brand. If a can feels unusually heavy for its size, has visible dents, or shows any discoloration around the seams, discontinue use immediately. Do not attempt to poke holes in it or try to fix it yourself. Instead, treat it as hazardous waste and follow your local community’s guidelines for disposing of pressurized containers safely. This proactive habit helps you catch defects before they become dangerous incidents.

Beyond storage and inspection, always use aerosol products in well-ventilated areas. Many wood protectors and sealants contain flammable solvents that can accumulate vapors in enclosed spaces. Ensure windows are open or fans are running to disperse fumes quickly. Furthermore, keep these products away from open flames, sparks, and pilot lights while you are using them and for a period after application until the product has fully cured. This reduces the risk of accidental ignition from stray sparks or static electricity.

Finally, make checking for recalls a routine part of your home maintenance calendar. Sign up for email alerts from the Consumer Product Safety Commission (CPSC) and follow major manufacturers on social media. Manufacturers often release safety updates quickly, and being informed allows you to act before a minor issue becomes a major hazard. By staying vigilant about product conditions and environmental factors, you protect not just your property, but the safety of everyone in your household.