Clear BioSeal Waterproof Caulk & Sealant 100% RTV Silicone - Long

In this review the Clear BioSeal 100% RTV silicone sealant is assessed as a practical, durable choice for household and light industrial sealing tasks; it is best for anyone needing a truly waterproof, flexible joint that resists yellowing over time. The single biggest reason to buy is its combination of full silicone waterproofing and a 50 year durability guarantee, which offers long-term protection around sinks, windows and wet areas. The cartridge format and low odor formula make it a sensible pick for indoor projects where scent and lasting clarity matter.

Key Features

• 100% Waterproof: The pure silicone formula provides a reliable barrier against water intrusion in wet zones.
• UV Protection: The sealant resists sun-driven deterioration so joints retain clarity and function outdoors.
• 50 Years Durability Guarantee: The manufacturer backs long-term performance, reducing the need for frequent re-sealing.
• 30-Minute Water-Ready: Seals can be exposed to water as soon as 30 minutes after application, speeding project completion.
• Shrink & Crack-Proof: The flexible compound accommodates temperature-driven expansion and contraction without splitting.
• Low Odor and Clear Finish: The low-odor, non-yellowing formulation keeps indoor spaces comfortable and leaves an invisible joint.

Who It's For

This sealant is aimed at homeowners, handymen and light trade professionals who need a long-lasting, clear silicone for kitchens, bathrooms, exterior trim and window glazing. Its quick water-ready time and low odor suit projects in occupied homes where downtime and fumes are concerns.

Those who should look elsewhere include users needing a non-silicone product for paintable joints or adhesives that bond porous materials where silicone is inappropriate; also, projects requiring specialty nozzles or applicator tips that differ from a standard cartridge setup.

Pros & Cons

Pros

• Clear, non-yellowing formula provides a durable, inconspicuous finish over years of exposure.
• Strong adhesion and flexibility keep seals intact through temperature changes and movement.
• Low odor during application makes indoor use more comfortable than solvent-based alternatives.
• Fast water-ready time speeds up jobs that require immediate exposure to moisture.

Cons

• Some users report mixed experiences with drying time and the included nozzle tip may not suit every detailed application.

Specifications

Product Type	100% RTV silicone sealant
Color	Clear
Container	10oz cartridge (pack of 10)
Water Ready	As little as 30 minutes
Durability	50 years guarantee (manufacturer claim)
Odor	Low odor

Our Verdict

The Clear BioSeal 100% RTV silicone is a solid value for anyone who wants a clear, waterproof, and long-lasting sealant that resists yellowing and handles outdoor exposure. Its combination of fast water-readiness, flexibility and low odor make it particularly useful for household wet-area repairs and installations where longevity and appearance matter.

Frequently Asked Questions

Is this sealant suitable for shower seams?
Yes, the 100% silicone formula is designed for wet environments and is water-ready in about 30 minutes, making it appropriate for shower seams.

Will it yellow over time?
The product is formulated with UV protection and is marketed to resist yellowing and color change over long-term exposure.

Can it be used outdoors?
Yes, the UV protection and flexibility for temperature changes make it suitable for exterior joints and trim.