Silicone sealants deliver exceptional flexibility, waterproofing, and long-term durability across residential, commercial, automotive, marine, and industrial applications. With resistance to UV, mold, extreme temperatures, chemicals, and continuous moisture exposure, silicone remains the most versatile choice for sealing bathrooms, kitchens, windows, doors, glazing assemblies, engines, aquariums, and high-performance mechanical systems.
Whether you’re looking for mold-resistant bathroom silicone, high-temperature RTV, aquarium-safe 100% silicone, or neutral-cure construction sealant, this category provides reliable solutions for every project.
For other material chemistries, including acrylic, polyurethane, hybrid, and specialty, visit our Caulk & Sealants parent category.
Why Use Silicone Sealant?
Silicone sealants offer advantages that other sealants, such as acrylic or polyurethane, cannot fully match. This makes silicone one of the most widely used sealing materials across construction, plumbing, automotive, HVAC, and DIY projects.
Key Reasons to Choose Silicone Sealant
- Waterproof & leak-proof performance: Ideal for bathrooms, kitchens, tubs, showers, sinks, tiles, and plumbing repairs.
- Mold & mildew resistance: Essential for sanitary applications where long-term cleanliness matters.
- High flexibility: Maintains elasticity in moving joints and vibration-prone areas such as windows, doors, baseboards, and trim.
- Extreme temperature resistance: High-temp and gasket maker silicones withstand 482–572°F (250–300°C).
- Chemical, UV & weather resistance: Performs reliably outdoors, on roofs, gutters, siding, flashing, vents, HVAC systems, and more.
- Strong bonding on non-porous surfaces: Excellent adhesion to glass, ceramic, porcelain, fiberglass, aluminum, stainless steel, plastics, and composites.
- Long lifespan: A durable, non-shrinking, non-peeling seal that outlasts many alternatives.
- Safe, 100% silicone options: Available for aquariums, food-grade projects, and sensitive materials requiring non-corrosive formulas.
Silicone sealant is often chosen as the best silicone sealant option for moisture-exposed, temperature-variable, or chemically challenging environments.
Where to Use Silicone Sealants?
Silicone sealants are ideal for a wide range of applications, including:
- Bathrooms, kitchens, tubs, showers, sinks & countertops
- Tile, ceramic, porcelain & backsplash sealing
- Windows, doors, weatherproofing & draft blocking
- Plumbing repairs, pipes & fixtures
- Glass, glazing, aquariums & underwater joints
- Automotive gasketing, RV repairs, engines & mechanical systems
- HVAC, ducts, vents & electrical components
- Roofing, gutters, flashing, siding & exterior gaps
- Fiberglass, metal, composite & plastic assemblies
- General maintenance, repairs, renovation & DIY projects
Types of Silicone Sealants (Product Groups)
Gasket Maker Silicone (Automotive & Mechanical Applications)
High-temperature RTV formulations designed for engines, pumps, motors, exhaust systems, and high-stress mechanical joints. Excellent oil, coolant, and vibration resistance.
Products:
- Stanley S430 High Temp Gasket Maker - RTV Silicone Sealant - Red
- Stanley S430 High Temp Gasket Maker - RTV Silicone Sealant - Black
- Kraken Bond Gasket Maker RTV Silicone
- Akfix HT300 High Temp Silicone Gasket Maker
RTV Silicone Sealants (General Purpose Repairs & Assembly)
Acetoxy-cure RTV silicone for windows, doors, plumbing, tile, glass, metal, and general indoor/outdoor maintenance.
Products:
- Stanley S421 All Purpose RTV Silicone Sealant (Acetoxy Cure)
- Kraken Bond All Purpose RTV Silicone
- Stanley S430 High Temp Gasket Maker - RTV Silicone Sealant - Red
- Stanley S430 High Temp Gasket Maker - RTV Silicone Sealant - Black
- Kraken Bond Gasket Maker RTV Silicone
Aquarium-Safe 100% Silicone (Non-Toxic, Underwater Use)
Formulated for aquarium construction, glazing, marine use, and full water immersion. Safe for fish and aquatic plants after curing.
Products:
- Stanley S420 Specialty Aquarium Silicone
- Kraken Bond Aquarium 100% Silicone Sealant
- Akfix 100AQ Aquarium Silicone Sealant
High-Temperature Silicone Sealants (Ovens, Fireplaces & Engines)
Silicones engineered for extreme heat, engines, stoves, chimneys, appliances, and industrial high-temperature systems. Some products in this group are silicate-based rather than silicone, but are listed here because they serve similar high-temperature sealing purposes.
Products:
- Stanley S430 High Temp Gasket Maker - RTV Silicone Sealant - Black
- Stanley S430 High Temp Gasket Maker - RTV Silicone Sealant - Red
- Kraken Bond Gasket Maker RTV Silicone
- Akfix HT300 High Temp Silicone Gasket Maker
- Kraken Bond Fireplace Sealant - Fireplace Caulk
- Stanley 2700 °F High Temperature Sealant Fireplace & Stove
- Akfix A 1500 Heat Fighter - High Temp Fireplace Sealant
Kitchen & Bathroom Silicone (Sanitary, Mold-Resistant)
Mold-resistant, waterproof silicone for sinks, tubs, showers, tiles, countertops, and high-moisture environments.
Products:
- Stanley S422 Kitchen & Bath Tub & Tile Silicone Sealant (Acetoxy cure)
- Stanley S424 Kitchen & Bath Premium Silicone, White (Neutral cure)
- Kraken Bond Hyper Kitchen & Bathroom Silicone
- Kraken Bond Kitchen & Bathroom Silicone Sealant
- Akfix 100S Sanitary Kitchen & Bathroom Silicone Sealant
- Akfix 918N Silicone Caulk for Kitchen and Bathroom
Construction-Grade Neutral Cure Silicone (Façades & Exterior Use)
Neutral-cure silicones offering low odor, non-corrosive adhesion and excellent exterior performance on metal, concrete, stone, PVC, and composite materials.
Products:
- Kraken Bond Neutral Cure Building-Construction Silicone Sealant
- Akfix 905N Neutral Silicone Sealant (Building & Construction)
- Akfix 100E Universal Silicone Sealant
- Stanley S425 Window & Door All Weather Pro Silicone Sealant
Mirror Silicone Adhesive (Non-Corrosive, Neutral Cure)
Safe for mirror backing—won’t damage reflective coatings or metals. Designed for secure, long-lasting mirror installation.
Product:
Frequently Asked Questions (FAQs)
What is silicone sealant used for?
It’s used for sealing bathrooms, kitchens, windows, doors, plumbing, glass, concrete, metal, appliances, electronics, HVAC systems, and automotive components.
Is silicone sealant waterproof?
Yes. Silicone is one of the most waterproof sealants available, making it ideal for showers, tubs, sinks, tile, and exterior joints.
What is the best silicone sealant for bathrooms?
Sanitary silicone with mold-resistant additives is recommended for bathrooms, showers, tiles, and countertops.
What is the difference between silicone and caulk?
Silicone is waterproof, flexible, and non-paintable. Caulk (often acrylic) is paintable but less durable in wet areas.
Can silicone sealant be used on metal and plastic?
Yes, silicone adheres very well to aluminum, stainless steel, vinyl, PVC, fiberglass, polycarbonate, and many plastics.
How long does silicone sealant take to dry?
Skin forms in minutes; full cure usually takes 24 hours, depending on humidity and bead thickness.
Does silicone shrink or peel?
High-quality silicone does not shrink or peel. Peeling typically indicates poor surface preparation.
Is silicone sealant suitable for automotive or RV use?
Yes. RTV and gasket maker silicones are ideal for engines, exhaust components, and RV sealing.
Is silicone safe for aquariums?
Only 100% silicone aquarium formulas are safe for aquatic life once fully cured.