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Understanding the specific threats facing your silo and grain storage structures is the first step toward implementing an effective preservation strategy. Each type of threat requires a tailored approach, and modern polyurea coating systems are engineered to address the full spectrum of these challenges simultaneously.
Steel grain bins are the most common form of bulk grain storage in North America, and corrosion is their most persistent enemy. The interior environment of a grain bin is surprisingly aggressive — grain dust, organic acids, carbon dioxide produced by respiration, and fluctuating humidity levels combine to create conditions that accelerate electrochemical corrosion at rates far exceeding what would occur in a typical outdoor environment. Roof seams, bottom rings, and wall panels are particularly vulnerable, and once corrosion begins, it progresses exponentially as the pit becomes a reservoir for moisture and grain fines.
Water is the single greatest enemy of stored grain quality. Grain stored at moisture levels above 14% is at serious risk of spoilage, and even brief exposure to elevated humidity can initiate mold and mycotoxin development that quickly renders an entire lot unsaleable. Moisture enters grain storage structures through roof leaks, wall penetrations, foundation seepage, and condensation forming on cold surfaces during temperature transitions. An effective grain storage preservation system must create a completely watertight envelope around the storage structure.
Concrete silos present a different set of challenges. Over time, atmospheric carbon dioxide penetrates the concrete matrix in a process called carbonation, which gradually reduces the alkalinity of the concrete and causes steel reinforcement to corrode — expanding as it rusts and creating internal pressure that eventually produces spalling and cracking. Once concrete begins to crack, water infiltration accelerates the process dramatically. Concrete dust and aggregate contamination of stored grain create food safety issues and potential equipment damage.
Grain storage facilities regularly employ chemical fumigants such as phosphine gas to control insect infestations. These chemicals are highly reactive and can attack unprotected metal surfaces, seals, and structural materials. Similarly, grain dust itself contains oils, enzymes, and organic acids that slowly degrade unprotected surfaces. A high-performance chemical-resistant coating system is essential for protecting silo infrastructure from these ongoing chemical attacks.
The processes of filling and emptying grain storage structures create significant mechanical stresses. Grain flowing at high velocity impacts interior surfaces with considerable force, creating abrasive wear. Heavy equipment operating near grain bins can cause ground vibration and physical impact damage. Conveyor systems, augers, and bucket elevators subject silo components to repeated mechanical loading that can initiate fatigue cracking in welds and structural connections.
Over the past two decades, polyurea elastomeric coatings have emerged as the gold standard for industrial protective coating applications — and for grain silo and storage preservation, they represent a generational leap beyond traditional coating technologies. Understanding why polyurea is uniquely suited to grain storage applications requires a brief examination of the chemistry and properties that set it apart. Polyurea is a two-component coating system formed by the rapid reaction of an isocyanate component with an amine-terminated resin. The result of this reaction is a cross-linked elastomeric polymer with a combination of properties that no other single coating technology can match: extreme elongation and flexibility (up to 500%), outstanding tensile strength, rapid cure times (gel time as fast as 5 seconds), excellent adhesion to properly prepared substrates, and formidable resistance to moisture, chemicals, abrasion, and impact. For grain storage applications specifically, these properties translate into real-world performance advantages that directly protect the value of stored grain and the structural integrity of the storage asset. ArmorThane has developed a comprehensive range of polyurea and hybrid coating systems specifically optimized for agricultural grain storage environments, with formulations available for interior liner applications, exterior waterproofing, structural reinforcement, and specialty applications including food-contact safe surfaces.
ArmorThane Agricultural Advantage: All ArmorThane polyurea formulations for interior grain storage applications are engineered to meet USDA and FDA guidelines for food contact surface applications, ensuring that your coating investment does not create new food safety compliance concerns. Our systems are also VOC-compliant and designed for minimal disruption to ongoing facility operations.
Every grain storage preservation project begins with a comprehensive site assessment conducted by an ArmorThane-certified coatings specialist. This assessment includes visual inspection and documentation of existing surface conditions, moisture meter readings at multiple locations, adhesion testing on representative substrate areas, identification of any existing coating that may require removal, and determination of ambient and substrate temperature and humidity conditions. The assessment results in a detailed project specification that defines the surface preparation requirements, coating system selection, application parameters, and expected performance outcomes.
Pure polyurea coating systems require specialized plural-component spray equipment capable of heating both components to 140–160°F and delivering them at pressures of 2,000–3,500 PSI with precise ratio control. ArmorThane applicators utilize state-of-the-art proportioning equipment, high-capacity heater systems, and purpose-built spray guns to ensure that the polyurea reaction occurs precisely as specified by the formulation chemistry. Environmental control — including temperature, humidity, and ventilation — is monitored continuously throughout the application process to ensure optimal cure conditions.
The polyurea coating is applied in multiple passes to achieve the specified dry film thickness, with each pass applied before the previous pass has fully cured to ensure chemical crosslinking between layers. Application rate, pass speed, gun distance, and spray angle are carefully controlled to maintain consistent film thickness across all areas of the substrate. Complex geometrical areas — including corner transitions, weld seams, penetrations, and fastener heads — receive additional detail application to ensure adequate film build at these critical areas. Wet film thickness is monitored continuously during application using calibrated gauges.
Pipe boots, drains, HVAC curbs, parapet walls, expansion joints, and all roof penetrations are detailed with compatible sealant, flashing tape, or an embedded fabric reinforcement layer before coating. These transitions are where the majority of roof failures originate. Proper detailing is the most important work on any roof coating job.
Upon completion of the coating application, a comprehensive quality control inspection is conducted. Dry film thickness measurements are taken at a density of not less than one reading per 100 square feet of coated surface, with additional readings at all geometrically complex areas. Holiday (pinhole) detection testing is performed using electronic holiday detectors calibrated to the appropriate voltage for the specified film thickness. Adhesion pull-off testing is conducted at representative locations to verify the coating-to-substrate bond strength. All test results are documented and provided to the facility owner as part of a comprehensive project completion report.
ArmorThane polyurea systems cure extremely rapidly — most formulations achieve walk-on strength within 30 seconds of application and are ready for light service within 24 hours. Full chemical cure and maximum physical properties are typically achieved within 7 days. Return-to-service timelines for grain storage applications are dramatically shorter than competing coating systems, minimizing downtime during the critical pre-harvest preparation period. ArmorThane applicators provide facility owners with a comprehensive maintenance guide and recommended inspection schedule to ensure the long-term performance of the coating system.
When evaluating protective coating options for your grain storage facility, it is essential to compare the performance characteristics that matter most in an agricultural environment. The following comparison presents an objective assessment of polyurea systems versus the most commonly used alternatives.
Consider a grain elevator operator managing a storage capacity of 500,000 bushels of corn. At a market price of $5.00 per bushel, the total value of grain in storage at any given time is $2.5 million. Research consistently demonstrates that inadequate storage protection results in grain losses of 2–5% annually through spoilage, moisture damage, and contamination. At the low end of this range, a 2% annual loss represents $50,000 in direct grain value destruction — every single year. A comprehensive polyurea coating system for a facility this size might cost $150,000 to $200,000 — meaning it pays for itself in grain preservation value alone within 3 to 4 years, and then continues generating savings for the next 20+ years of its service life.
Get a free consultation with an ArmorThane agricultural coatings specialist and discover how our polyurea systems can protect your grain storage assets for 25+ years.
Yes. ArmorThane formulates specific polyurea products that comply with USDA and FDA regulations for incidental food contact applications. These products have been independently tested and certified to confirm that they do not off-gas harmful compounds under normal grain storage conditions and do not transfer contaminants to stored grain. When properly applied and fully cured, ArmorThane’s food-contact compliant polyurea systems are completely inert in grain storage environments. Always confirm with your ArmorThane representative that the specific product specified for your project is the appropriate food-contact compliant formulation.
The total project duration depends on the size and condition of the grain storage structure, but most single-bin interior lining projects can be completed within 2 to 5 days from start of surface preparation through coating completion and quality control inspection. Because polyurea cures extremely rapidly — achieving walk-on strength in seconds and light service readiness within 24 hours — the bin can typically be returned to grain storage service within 48 to 72 hours of coating completion. This dramatically shorter downtime period compared to epoxy or polyurethane systems is a critical advantage for operations with limited pre-harvest preparation windows.
When properly applied over adequately prepared substrate and maintained according to the manufacturer’s recommendations, ArmorThane polyurea coating systems routinely achieve service lives of 20 to 30 years in grain storage applications. The key determinants of service life are the quality of the initial surface preparation, the coating film thickness achieved, and the frequency and quality of routine maintenance inspections. ArmorThane recommends annual visual inspections of all coated grain storage surfaces, with periodic adhesion testing every 5 years to verify the ongoing integrity of the coating-to-substrate bond.
In many cases, yes — but the condition and adhesion of the existing coating must be carefully evaluated before proceeding. If the existing coating is firmly adhered, in sound condition, and compatible with the specified polyurea system, it may be possible to apply the new polyurea over the existing coating after appropriate surface preparation. However, if the existing coating shows signs of delamination, blistering, cracking, or contamination, complete removal is required before the new polyurea system is applied. Attempting to overcoat failed or poorly adhered existing coatings will result in premature failure of the new system as well. Your ArmorThane coatings specialist will evaluate the existing coating condition and provide a specific recommendation.
On a first-cost basis, polyurea typically represents a higher initial investment than epoxy or polyurethane systems. However, when evaluated on a life-cycle cost basis — accounting for the much longer service life of polyurea (20–30 years versus 5–10 years for epoxy), the lower maintenance requirements, the superior grain protection performance, and the avoidance of premature recoating cycles — polyurea consistently delivers the lowest total cost of ownership of any grain storage coating option. Most ArmorThane clients who perform a rigorous life-cycle cost analysis conclude that polyurea is not the expensive option — it is the most cost-effective option available.
ArmorThane’s certified applicator network has successfully completed grain storage coating projects ranging from small on-farm bins of 5,000-bushel capacity to commercial grain elevator facilities with multiple million-bushel storage structures. The spray-applied polyurea system is highly adaptable to structures of any size and configuration. For very large projects, multiple application crews and proportioning units may be deployed simultaneously to complete the project within the required timeframe. Contact your ArmorThane representative to discuss the specific project scale and any logistical requirements for your facility.
Whether you’re a builder, contractor, or homeowner — ArmorThane’s certified polyurea applicator network is ready to deliver permanent foundation waterproofing protection in your area.
Year Lifespan
Tyler Gleckler is a coatings specialist with deep field expertise in polyurea, polyaspartic, and high-performance protective systems. His writing appears regularly in Polyurea Magazine, the American Polyurea Organization, ArmorThane’s technical library, and a range of industry publications. He focuses on translating laboratory chemistry into specifications that engineers, owners, and applicators can actually deploy.
ArmorThane has built a strong reputation over the past 30 years for producing high-quality, durable protective coatings.
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