Akfix 100E RTV White Silicone Caulk - Waterproof Kitchen & Bath

In this review the Akfix 100E RTV White Silicone Caulk is presented for homeowners and DIYers who need a reliable, waterproof seal around sinks, showers, windows and doors; the single biggest reason to buy is its long-term flexibility and resistance to aging that keeps joints sealed without cracking. The reviewer found it useful for routine bathroom and kitchen work where a permanently elastic, white silicone is required and where a good color match and value for money matter as much as adhesion.

Key Features

• Universal compatibility: Works as an all-purpose RTV silicone gap filler for common household joints in bathrooms and kitchens, suitable for many non-porous surfaces.
• Permanently elastic: Remains flexible after curing so sealed joints can move without the caulk splitting or losing adhesion.
• Waterproof performance: Designed to provide a watertight seal around showers, tubs and sinks to prevent leaks and moisture damage.
• Strong adhesion: Bonds well to porcelain, glass, steel and most non-porous building materials for a durable seal.
• Fast curing: A quick-setting silicone mastic that reduces downtime between application and use of the sealed area.

Who It's For

Homeowners, renters and DIY enthusiasts who routinely seal bathroom and kitchen fixtures will appreciate this caulk for shower surrounds, bathtub seams, sinks and window perimeters where a white finish is desired. It is a practical choice when a waterproof, permanently elastic seal is needed and when working with common non-porous materials like glass, porcelain and painted surfaces.

Professionals or projects requiring mirror work or contact with sensitive metals like copper, brass or lead should look elsewhere because the product cures by acidic chemistry and is not recommended for those materials. Also, buyers seeking an ultra-long shelf life should note customer reports of variable shelf stability.

Pros & Cons

Pros

• Provides a clean white finish that commonly matches bathroom fixtures well.
• Strong adhesion to non-porous materials yields a durable, long-lasting seal.
• Remains permanently elastic after curing, reducing risk of cracking over time.
• Good value for a multipack option and useful for multiple small projects.

Cons

• Because it cures via acidic chemistry it must not be used on mirrors or sensitive metals like copper or brass.
• Application feedback is mixed; some users report it can be messy or tricky to apply neatly.

Specifications

Our Verdict

The Akfix 100E is a sensible, cost-effective choice for homeowners and DIYers who need a waterproof, permanently elastic white silicone for routine kitchen and bathroom sealing. It offers strong adhesion and a good color match for white fixtures, but avoid using it on mirrors or sensitive metals and expect some variation in ease of application and shelf life.

Frequently Asked Questions

Can this be used on mirrors?
No; because it cures by acidic chemistry it should not be used on mirrors or sensitive metals like copper or brass.

Is it waterproof after curing?
Yes; once fully cured it provides a waterproof, permanently elastic seal suitable for showers, tubs and sinks.

What surfaces does it bond to?
It bonds well to common non-porous surfaces such as glass, porcelain, steel and painted materials but is not recommended for porous stone or sensitive metals.