Boss 315 Clear Silicone Sealant – Waterproof & Flexible Adhesive 8oz

Professional-Grade Silicone Sealant for Durable, Watertight Bonds

Get industrial-strength sealing and waterproof protection with Boss 315 Clear Silicone Sealant, an 8 oz multi-purpose adhesive trusted by pool professionals, contractors, and homeowners alike. This 100% RTV (Room Temperature Vulcanizing) silicone provides a permanent, flexible, and watertight bond on a wide range of materials, including glass, metal, plastic, fiberglass, concrete, and ceramics.

Whether you’re sealing pool fittings, repairing joints, or weatherproofing outdoor equipment, Boss 315 Clear Silicone delivers long-lasting performance that stands up to moisture, vibration, and UV exposure.

100% Silicone – Flexible, Strong, and Reliable

Unlike acrylic or hybrid sealants that can shrink or crack over time, Boss 315 is made from 100% pure silicone, ensuring maximum elasticity and durability. It forms a flexible yet strong seal that moves naturally with expansion, vibration, and temperature changes—making it ideal for both indoor and outdoor applications.

Key Benefits

• 100% RTV silicone – professional-grade formulation.

• Waterproof and weather-resistant – ideal for wet or outdoor use.

• Clear, non-yellowing finish – blends seamlessly with most materials.

• Excellent adhesion on glass, metal, plastic, and concrete.

• Remains flexible after curing—won’t crack or peel.

• Mold and mildew resistant for long-term clarity.

• Temperature resistant from -60°F to +400°F (-51°C to +204°C).

It’s the ultimate all-purpose sealant for construction, pool maintenance, plumbing, and repair work.

Built for Pool, Spa, and Plumbing Applications

Boss 315 Clear Silicone Sealant is commonly used in pool and spa installations, PVC fittings, skimmer gaskets, and tile joints where watertight sealing is critical. It adheres to wet and damp surfaces better than many other sealants, making it a go-to product for both professional pool technicians and DIY repair projects.

Common Pool & Spa Uses

• Sealing light niches and conduit openings.

• Securing vinyl and fiberglass fittings.

• Waterproofing skimmer and return fittings.

• Sealing pump housing and filter connections.

• Repairing tile grout lines or coping joints.

Once cured, the clear finish creates a clean, nearly invisible bond that maintains your pool’s aesthetic while providing long-term protection.

Excellent Adhesion Across Multiple Surfaces

Boss 315 Clear Silicone adheres to a wide variety of materials without the need for a primer. Its versatility makes it suitable for:

• Glass and acrylic

• Ceramic and tile

• Aluminum and stainless steel

• PVC and ABS plastics

• Fiberglass and epoxy composites

• Concrete and masonry surfaces

The strong chemical bond ensures watertight sealing, even on dissimilar materials—ideal for multi-surface applications in wet environments.

Non-Corrosive, Neutral Cure Formula

Unlike acidic silicones that can damage sensitive surfaces like metal or concrete, Boss 315 features a neutral cure formulation that won’t corrode, discolor, or release strong odors. It’s safe for use near electronics, metals, and water systems.

This makes it especially useful for:

• Electrical conduit seals

• Pool light housing repairs

• Metal fittings and mechanical connections

Fast Cure, Permanent Seal

Boss 315 begins curing immediately upon exposure to moisture in the air, forming a durable skin within minutes and fully curing in 24 hours. Once set, it remains permanently flexible and watertight, resisting pressure, vibration, and extreme temperatures.

Application Steps

1. Clean and dry surfaces before application.

2. Cut the nozzle tip at a 45° angle for desired bead size.

3. Apply continuous bead to joint or repair area.

4. Smooth bead within 5 minutes for a professional finish.

5. Allow 24 hours for full cure before submersion or heavy use.

It’s easy to apply with standard caulking guns or direct-squeeze tubes, providing precision control and minimal waste.

Long-Term Resistance to Moisture and Chemicals

Once cured, Boss 315 Silicone Sealant forms a non-porous, rubber-like seal that resists degradation from:

• Pool chemicals (chlorine, bromine, and salt)

• UV rays and sunlight exposure

• Ozone and oxidation

• Temperature extremes and mechanical stress

This makes it an excellent choice for long-term use in high-moisture environments like pools, spas, and bathrooms.

Safe and Non-Toxic Once Cured

After curing, Boss 315 Clear Silicone is completely non-toxic and inert, making it safe for use around water systems, aquatic environments, and food contact surfaces. It will not leach chemicals or affect water quality.

Product Specifications

Storage and Handling

• Store in a cool, dry location below 80°F.

• Keep tightly sealed when not in use.

• Avoid contact with uncured silicone until ready to apply.

• Always use in a well-ventilated area during application.

Avoid mixing with acrylic or solvent-based products, and allow full cure before painting or submersion.

Why Choose Boss 315 Silicone

With decades of proven performance, Boss 315 Clear Silicone remains a favorite among pool builders, plumbers, and general contractors who need dependable sealing power in tough conditions. Its clarity, flexibility, and industrial-grade adhesion make it a versatile tool for any maintenance or installation project.

The Boss 315 Advantage

• Industry-proven reliability and strength.

• Neutral-cure formula safe for metals and plastics.

• Professional-grade seal that lasts years, not months.

• Perfect for pool, plumbing, construction, and marine use.

When you need a waterproof seal you can trust—choose Boss 315 Clear Silicone for unbeatable performance.

Buy with Confidence from Benchmark Pool Supply

At Benchmark Pool Supply, we stock only authentic Boss sealants used by pool professionals and technicians across the U.S. The Boss 315 Clear Silicone Sealant (8 oz) delivers flexible, waterproof, and durable sealing for pool, plumbing, and general construction projects.

We provide fast shipping, verified authentic products, and expert advice so you can get the right materials for every job.

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Frequently Asked Questions

What materials does Boss 315 adhere to?

Boss 315 Clear Silicone Sealant bonds to glass, metal, tile, fiberglass, concrete, and most plastics, creating a long-lasting, watertight seal.

Can it be used underwater?

No. Apply and allow 24 hours to cure before submersion. Once cured, the sealant is completely waterproof and safe for underwater conditions.

Is Boss 315 safe for pool use?

Yes. It’s resistant to chlorine, saltwater, and UV, making it ideal for pools, spas, and plumbing systems.

Does it shrink or crack over time?

No. Boss 315 remains permanently flexible, even under temperature swings or movement.

Can it be painted after curing?

No. Silicone cannot be painted directly. For paintable applications, use a paintable-grade caulk or hybrid sealant instead.