Akfix 100E RTV White Silicone Caulk - Durable Waterproof Sealant

In this review the Akfix 100E RTV White Silicone Caulk is evaluated for homeowners and DIYers who need a reliable, fast-drying seal for kitchens and bathrooms; the single biggest reason to buy is its combination of fast acetoxy cure and long-term elasticity, which makes it a practical choice when a waterproof, flexible joint is required. The review focuses on everyday use around showers, sinks, windows and doors and notes how the product balances quick tack-free time with strong adhesion on common non-porous surfaces.

Key Features

• Universal silicone: An all-purpose RTV silicone suitable for general gap filling and bonding tasks in kitchens and bathrooms.
• Permanently elastic: Remains flexible after curing so joints tolerate movement without cracking or failing over time.
• Fast acetoxy cure: Becomes tack-free in minutes in many conditions, which speeds up projects with tight timelines.
• Strong adhesion: Bonds well to common non-porous building materials delivering a durable seal resistant to ageing and discolouring.
• Multi-surface use: Designed for use on door and window frames, glass, porcelain and steel, making it versatile for household repairs.
• Waterproof performance: Specifically formulated for wet areas such as showers and tubs to provide a long-lasting waterproof seal.

Who It's For

This caulk is best for homeowners, renters and DIY enthusiasts who need a waterproof, fast-drying sealant for bathroom and kitchen jobs like sealing tubs, sinks, shower seams and window perimeters. It suits people who value a durable, elastic joint and faster tack-free times compared with many neutral cure silicones.

Those working with mirrors or sensitive metals such as copper, brass or lead should look elsewhere because the product cures by an acidic (acetoxy) process that can damage those surfaces. Professional glass or specialty metal installers who require neutral cure chemistry will also prefer a different sealant.

Pros & Cons

Pros

• Good sealer quality with strong adhesion to common non-porous materials, making it reliable for bathrooms.
• Fast curing action reduces downtime and lets projects move ahead quickly.
• Remains permanently elastic after cure, helping joints withstand movement without cracking.
• Solid value when buying for multiple small projects or routine household maintenance.

Cons

• Acetoxy curing means it is not safe for mirrors or sensitive metals like copper and brass.
• Some users report mixed ease of application and a short effective shelf life if left unused for months.

Specifications

Product type	Acetoxy cure RTV silicone sealant
Color	White
Quantity	48 tubes of 10.1 fl.oz. each
Primary use	Kitchen, bathroom, shower, toilet, sink, window and door sealing
Cure characteristic	Fast tack-free time; full cure may take up to 24 hours
Adhesion	Strong on non-porous building materials
Limitations	Not for mirrors or sensitive metals; application between 41F and 104F

Our Verdict

The Akfix 100E is a practical, value-oriented silicone sealant for general household sealing tasks where fast cure and long-term elasticity matter. Buy it if you need a waterproof, durable caulk for tubs, sinks and windows and can avoid mirrors or sensitive metals; it offers solid adhesion and quick tack-free times that save time on renovation or repair work.

Frequently Asked Questions

Can this be used in showers?
Yes. It is formulated as a waterproof silicone sealant suitable for showers, tubs and other wet areas.

Is it safe on mirrors and brass?
No. This acetoxy cure silicone is acidic during cure and should not be used on mirrors or sensitive metals like copper or brass.

How fast does it dry?
It often becomes tack-free in minutes, but full cure can take up to 24 hours depending on conditions.