Caulk and sealants provide long-lasting, flexible, and waterproof protection across construction, automotive, marine, HVAC, and home improvement applications. From bathroom and kitchen sealing to window and door weatherproofing, concrete joint filling, exterior siding, glazing, and high-temperature repairs, these products deliver reliable performance in demanding environments.
This category includes silicone, acrylic, hybrid polymer, polyurethane, and specialty formulations designed to seal gaps, stop leaks, prevent drafts, reduce vibration, and bond a wide range of materials.
Use the sections below to choose the right product family for your project.
Where Are Caulks & Sealants Used?
Caulks and sealants are essential across residential, commercial, and industrial environments. Common applications include:
- Bathrooms, kitchens, tubs, showers, sinks, and countertops
- Tile, backsplash, ceramic, porcelain, and wet-area sealing
- Windows, doors, frames, glazing, and weatherproofing
- Plumbing systems, pipes, joints, and fixtures
- Glass, aquariums, underwater seals, and glazing assemblies
- Automotive engines, RV sealing, gaskets, and mechanical repairs
- HVAC systems, ducts, vents, and electrical components
- Roofing, gutters, siding, flashing, exterior cracks, and gaps
- Metal, fiberglass, composite, concrete, brick, and stone joints
- General maintenance, restoration, DIY repairs, and home improvement
Because no single sealant works for every situation, the categories below help you navigate directly to the best product for your specific material and environment.
Explore Caulk & Sealant Types
Silicone Sealant
Best for: bathrooms, kitchens, showers, glass, windows, doors, aquariums, high-temperature repairs, HVAC, and automotive applications.
Silicone sealant offers unmatched flexibility, waterproofing, mold resistance, UV durability, and strong adhesion to non-porous surfaces.
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Acrylic Sealant
Best for: interior gaps, trim, baseboards, drywall repairs, and paint-grade finishing.
Acrylic sealant is low-odor, easy to apply, cleans with water, and creates a smooth, paintable joint; ideal for indoor architectural work.
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Paintable Hybrid Sealant (MS/AST Polymer)
Best for: siding, façades, moving joints, exterior gaps, roofing, and metal-to-concrete connections.
Hybrid polymer sealants combine silicone-like flexibility with polyurethane-like strength while remaining fully paintable and weather-resistant.
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Polyurethane Sealant
Best for: concrete expansion joints, metal bonding, outdoor construction, roofing, automotive applications, and structural sealing.
Polyurethane provides superior mechanical strength, vibration resistance, and long-term durability, especially on porous surfaces.
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Specialty Sealant
Best for: extreme temperatures, fireplaces, stoves, chimneys, engines, underwater use, and chemical exposure.
Specialty sealants include high-temperature silicones, sodium-silicate firebox sealants, aquarium-safe silicones, and industrial-grade gasket makers.
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Frequently Asked Questions (FAQs)
What is caulk used for?
Caulk is used to fill gaps and cracks, block drafts, and provide paintable interior finishing; it is commonly used around trim, walls, ceilings, and moldings.
What is the difference between caulk and sealant?
Caulk (often acrylic) is paintable but less flexible. Sealants (such as silicone, polyurethane, and hybrid) offer greater elasticity, waterproofing, and enhanced outdoor durability.
Which sealant is best for bathrooms or showers?
Mold-resistant sanitary silicone sealant is the best choice.
Which sealant works best for concrete joints?
Polyurethane sealants or hybrid sealants are preferred for expansion joints and heavy movement.
What should I use for high temperatures?
Use high-temperature RTV silicone, gasket makers, or fire-rated fireplace sealants.
Can I use one sealant for all surfaces?
No. Every sealant is designed for specific materials and conditions, so selecting the correct category ensures optimal results.