Realth SG119 Black RTV Silicone Gasket Maker, 100 g

Realth SG119 is a black RTV silicone gasket maker supplied as a 100 g paste. The listing describes it for automotive and mechanical sealing, with an advertised temperature range of -60º C to 280º C, but customer feedback indicates that curing may take longer than expected.

At a glance

Paste-form RTV sealant is listed for automotive parts and mechanical assemblies, including oil pans, water pumps and valve covers.
The manufacturer claims oil resistance, flexibility and an advertised operating range of -60º C to 280º C.
The listing describes application to a cleaned gasket or O-ring, followed by exposure to moisture in the air to form a seal.

Price

£8.49Save 15%

Reference price: ~~£9.99~~

Price checked: 12 Nov 2026

View offer

Pros and cons

Pros

A 100 g quantity and paste form suit small sealing or repair tasks.
The listed uses span vehicle and motorcycle components as well as some glass, wood and metal surfaces.

Cons

Customer feedback is mixed on cure time, with some reporting that it cures extremely slowly.

Technical specifications

13 specifications

Identity
Brand	Realth
Model	SG119

Dimensions and installation
Dimensions listed	19 x 9 x 3 centimetres
Weight listed	0.1 Kilograms

Materials and protection
Material listed	Silicone
Water resistance listed	Water Resistant
Form	Paste
Colour	Black
Compatible materials	Glass, Metal, Wood
Surface recommendations	Metal, Glass, Wood, Automotive Parts, Pipe, Counter Top, Sink, Tub, Window, Door

Quantity and claimed performance
Number of packs	1
Claimed temperature range	-60º C ~ 280º C
Claimed full setting time	24H

What to know before buying

Listing details to confirm

The maker claims complete setting after 24H, while customer feedback also reports very slow curing. Allow for the stated cure condition and time before relying on a seal, and confirm suitability for the specific joint and application.

Who is it for?

A good fit for

Vehicle or motorcycle owners needing a small quantity of RTV sealant for a compatible gasket or mechanical joint.
DIY users seeking a black silicone paste listed for metal, glass or wood sealing tasks.

Less suited to

Buyers who need a verified rapid-cure product or a confirmed compatibility specification for a particular engine, sensor or chemical exposure.

Realth SG119 Black RTV Silicone Gasket Maker, 100 g · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 1,544 ratings

5 stars73%73%
4 stars15%15%
3 stars7%7%
2 stars1%1%
1 star4%4%

Customer feedback describes the sealant as good quality and easy to apply, and some users report no leakage during use. Opinions are mixed on durability, tube integrity, value and drying time, including reports of tubes breaking and slow curing. The cure-time concern matters for buyers planning a quick repair, particularly because the listing gives a 24H full-setting claim.

Positive themes

Customers describe the sealant as good quality and easy to apply.
Some users report no leakage during use.

Negative themes

Some customers report that the tube breaks.
Some customers report very slow curing.

Mixed feedback

Durability and value receive mixed feedback.

Frequently asked questions

What is Realth SG119 intended for?

The listing describes it for automotive and motorcycle work, machine equipment and mechanical assemblies, including oil pans, water pumps, timing covers and valve covers.

How much is in the listed pack?

The listing specifies 100.0 gram and one pack.

How long does it take to set?

The manufacturer states that it sets completely after 24H when exposed to moisture in the air. Customer feedback also includes reports of very slow curing, so allow adequate time before use.

What temperature range is advertised?

The listing claims a range of -60º C ~ 280º C. This is a manufacturer claim, not an independently verified performance result.