Black 24-Pack Akfix 100E RTV Silicone Caulk - 24x10.1 fl.oz. Pack

Our review of the Akfix 100E RTV Black Silicone Caulk focuses on practical use in homes and light commercial spaces where a durable, waterproof black sealant is needed. This 24-pack of 10.1 fl.oz. cartridges targets homeowners, contractors doing repetitive sealing jobs, and anyone sealing wet areas such as showers and sinks. The single biggest reason to buy is the product's long-term elasticity and strong adhesion on common non-porous surfaces, which makes it a dependable choice for kitchen and bathroom sealing tasks.

Key Features

• Universal silicone: Works as an all-purpose RTV gap filler suitable for a range of general-purpose bonds in bathrooms and kitchens.
• Waterproof and flexible: Cures to a permanently elastic seal that maintains flexibility after curing, ideal for movement around fixtures.
• Easy DIY application: Cartridges are intended for straightforward use by homeowners for sealing gaps around windows, door frames, baseboards, and walls.
• Strong adhesion: Bonds well to common non-porous building materials and resists ageing, cracking, and discolouring over time.
• Surface compatibility: Fast-curing mastic suitable for door, window, glass, porcelain, and steel surfaces, with a caution to avoid mirrors and sensitive metals.

Who It's For

The Akfix 100E in black is best for homeowners, maintenance teams, and tradespeople who need a consistent, waterproof silicone seal for repeated jobs, especially in bathrooms, kitchens, and window or door surrounds. The black color helps when a dark finish is required for aesthetic or concealment reasons.

It is less suitable for applications on mirrors or sensitive metals such as copper, brass, or lead due to acidic curing. Buyers who need a neutral-cure silicone for those sensitive substrates should look for an alternative formulated specifically for mirror-safe or metal-safe use.

Pros & Cons

Pros

• Good value for bulk projects because the 24-pack supplies many joints and fixtures.
• Durable, waterproof seal that remains elastic and resists cracking and discolouring.
• Strong adhesion to common non-porous building materials like glass, porcelain, and steel.

Cons

• Acidic curing restricts use on mirrors and sensitive metals; not suitable for all substrates.
• Some customers report mixed build quality of the cartridges and issues with the tip, which can affect ease of application.

Specifications

Brand	Akfix
Model	100E RTV Silicone
Color	Black
Pack quantity	24 cartridges
Cartridge volume	10.1 fl.oz. each
Curing type	Acidic RTV silicone (fast-curing)

Our Verdict

The Akfix 100E Black silicone caulk is a sensible choice for anyone sealing showers, sinks, windows, or doors who needs a bulk supply of a waterproof, permanently elastic black sealant. It represents good value for repetitive jobs and provides reliable adhesion on common non-porous materials, though users should avoid mirrors and sensitive metals and be prepared for occasional cartridge quality variation.

Frequently Asked Questions

Can this silicone be used on mirrors?
No. The product cures by an acidic mechanism and should not be used on mirrors or sensitive metals like copper, brass, or lead.

Is this silicone suitable for shower seams?
Yes. It is waterproof, flexible after curing, and formulated for bathroom use, making it appropriate for shower seams and bathtub joints.

Will it stick to porcelain and glass?
Yes. It provides strong adhesion on common non-porous surfaces such as glass and porcelain.