Akfix 100E RTV Clear Silicone Caulk (48x10.1 fl.oz.) - 100% Waterproof

Our review of Akfix 100E finds it best suited for homeowners and handypersons who need a fast-curing, permanently elastic clear silicone for routine bathroom and kitchen sealing jobs. The single biggest reason to buy is its combination of rapid tack-free time and long-term flexibility, which makes it practical for re-caulking showers, sinks and window trim where a clear, non-yellowing finish matters. It is presented in bulk packaging for multiple projects and stands out where speed and adhesion to non-porous surfaces are priorities.

Key Features

• Universal silicone: Works as an all-purpose RTV gap filler suitable for common non-porous surfaces in kitchens and bathrooms for general sealing tasks.
• Permanent elasticity: Remains flexible after curing, so seals resist cracking and accommodate minor joint movement without failing.
• Fast curing: An acetoxy cure formula becomes tack-free in minutes for faster job turnaround, though full cure can take up to 24 hours.
• Strong adhesion: Bonds well to glass, porcelain and many construction materials, giving a durable seal against water intrusion.
• Many applicable surfaces: Rated for doors, windows, steel and similar materials, making it versatile for glazing and repair work.
• Easy DIY application: Designed for everyday sealing tasks such as around windows, door frames and baseboards for homeowners doing their own maintenance.

Who It's For

This product is aimed at DIYers, property maintenance teams, and contractors who need a reliable clear silicone for wet-area sealing and glazing on non-porous materials. Because it is supplied in a pack intended for multiple uses, it also suits users with several simultaneous projects or who prefer buying caulk in larger quantities.

Those who should look elsewhere include people needing a neutral-cure silicone for sensitive metals or mirrors, and anyone who requires an extended open time for very slow, meticulous tooling; the acetoxy cure is fast and acidic during curing and is not recommended for copper, brass or lead surfaces.

Pros & Cons

Pros

• Clear formula that resists yellowing and matches finishes well for visible joints.
• Fast tack-free time lets users finish projects quickly without long delays.
• Strong adhesion and permanent elasticity reduce the need for frequent rework.
• Good value for multiple small projects given the pack quantity and performance.

Cons

• Acetoxy (acidic) cure means it must not be used on mirrors or sensitive metals like copper and brass.
• Some customers report variable ease of application and a short effective shelf life once opened.

Specifications

Our Verdict

Akfix 100E is a practical, cost-effective clear silicone for routine wet-area sealing when fast tack-free time and lasting flexibility matter. It is good value for multiple projects and delivers strong adhesion on common non-porous surfaces, but avoid it on mirrors and sensitive metals due to its acidic cure.

Frequently Asked Questions

Can this silicone be used on mirrors?
No. The acetoxy acidic cure can damage mirror backing and sensitive metals, so use a neutral-cure product for mirrors.

How long until the seal is fully cured?
It often becomes tack-free in minutes, but full cure can take up to 24 hours depending on joint depth and conditions.

What surfaces bond best with this caulk?
It adheres well to non-porous surfaces such as glass, porcelain, steel, window frames and similar building materials.