Soudal Multi Purpose Silicone – General Purpose Acetoxy Silicone Sealant for Glazing, Kitchens & Bathrooms

Soudal Multi Purpose Silicone is a high‑quality, general purpose acetoxy
cure silicone sealant designed for flexible, waterproof sealing around windows,
doors, kitchens, bathrooms and many internal and external joints. Ideal for trades
and DIY projects where a reliable, permanently elastic silicone seal is required.

Soudal Multi Purpose Silicone is a one‑component, acetoxy curing silicone
sealant which vulcanises at room temperature in the presence of atmospheric
moisture to form a durable, permanently elastic rubber. It has been formulated as
a versatile, go‑to silicone for many common sealing jobs in building, glazing,
kitchen and bathroom work. Soudal Sealant Remover benefits include its effectiveness in dissolving cured silicone and other sealants, making it an essential tool for renovation projects. This product not only speeds up the removal process but also ensures a clean surface for new applications, enhancing the overall quality of the work. Additionally, its easy-to-use formula simplifies the often tedious task of removing old sealant. Soudal silicone spray product details highlight its ease of use and impressive performance in protecting surfaces. This silicone spray is particularly effective for lubricating and waterproofing various materials, making it ideal for both household and professional applications. Users appreciate its quick-drying formula and the wide range of surfaces it effectively bonds with.

The sealant provides excellent adhesion to a wide range of non‑porous substrates
commonly found in domestic and commercial environments, including glass, glazed
ceramics, enamel, many metals, and some rigid plastics (after compatibility checks).
Once cured, it forms a flexible, waterproof and weather‑resistant joint, making it
suitable for both interior and exterior use in non‑structural applications.

Typical Use Cases

• Glazing and window sealing – perimeter sealing between window frames and glass, or between frames and non‑porous reveals.
• Bathroom and sanitary joints – sealing around baths, basins, shower trays, sinks and tiled walls (check datasheet for mould‑resistant/sanitary grade suitability).
• Kitchen worktops and sinks – flexible waterproof seal between worktops, upstands, tiles and stainless steel or ceramic sinks.
• General interior joints – sealing internal corners and junctions where non‑porous materials meet (e.g. tiles to baths, splashbacks, trims).
• Light exterior sealing – weatherproofing around door and window frames, fascia and soffit trims on non‑porous substrates.

Usage & Application Tips

• Surface preparation:
  • All substrates must be clean, dry, and free from dust, grease, oil, soap residues and loose material.
  • Degrease with a suitable cleaner where necessary, especially on metal and plastic surfaces.
  • Remove old, failing sealant completely; use a dedicated sealant remover and/or mechanical scraping as required.
• Masking:
  • For very neat lines, apply masking tape to both sides of the joint before gunning.
  • Remove tape immediately after tooling while the sealant is still wet.
• Application:
  • Cut the cartridge tip and screw on the nozzle; cut the nozzle at an angle to the desired bead size.
  • Place the cartridge into a good quality sealant gun.
  • Fill the joint completely, applying continuous pressure to avoid air pockets.
• Tooling & finishing:
  • Tool the sealant within the skin‑forming time using a wetted spatula or profiling tool.
  • Ensure good contact with both sides of the joint and create a slightly concave finish to shed water.
• Curing:
  • Soudal Multi Purpose Silicone cures by reacting with moisture from the air.
  • Cure rate is typically around 2–3 mm per 24 hours, depending on joint depth, temperature and humidity (see datasheet).
  • Avoid cleaning or stressing the joint until fully cured.
• Important limitations:
  • As an acetoxy silicone, it may corrode some metals (e.g. bare mild steel, galvanised steel, some copper alloys) – check compatibility.
  • Not suitable for aquariums, natural stone (e.g. marble, granite) or mirrors unless specifically stated by Soudal.
  • Do not use on bituminous substrates or on surfaces that bleed oils/plasticisers (e.g. some rubbers, soft PVC).

Technical & Performance Overview

Soudal Multi Purpose Silicone is typically classified as an acetoxy cure building and glazing sealant
and is tested to relevant EN 15651 standards (e.g. façade and glazing) where applicable. Always refer
to the latest technical datasheet and Safety Data Sheet (SDS) for full details. Soudal Silirub LMN sealant applications are ideal for various sealing tasks around windows and doors, providing excellent adhesion and flexibility. This product is designed to withstand extreme weather conditions, ensuring durability and a long-lasting seal. When selecting the appropriate sealant, consider the specific requirements of your project to achieve optimal results.

• Chemistry: Acetoxy curing silicone rubber (RTV‑1, one‑component).
• Curing mechanism: Moisture‑curing; forms a permanently elastic silicone rubber.
• Consistency: Thixotropic paste – non‑sag in vertical joints.
• Movement capability: Suitable for low to moderate movement joints (see EN 15651 classification and datasheet for precise % movement).
• Temperature resistance: Cured sealant typically resistant from around ‑40 °C to +150 °C (check current datasheet).
• Weather & UV resistance: Excellent; silicone rubber is highly resistant to sunlight, ozone and ageing.
• Colours: Commonly available in clear and popular sanitary/building colours (e.g. white, translucent) – confirm available range with your supplier.
• Paintability: Like most silicones, it is not over‑paintable with standard paints; joint colour should be selected accordingly.
• Substrate compatibility: Glass, glazed tiles, enamel, many metals (e.g. aluminium, stainless steel), rigid PVC and other non‑porous surfaces. Always test on plastics and coated surfaces.
• Indoor / outdoor use: Suitable for interior and exterior sealing on appropriate substrates.
• Storage: Store in original, unopened packaging in a cool, dry place between recommended temperatures; protect from frost and high heat.
• Safety: Acetoxy cure silicones release acetic acid (vinegar‑like odour) during curing; ensure ventilation and avoid eye/skin contact. Follow SDS.

Soudal Multi Purpose Silicone Features & Customer Benefits

• True multi‑purpose performance
  One cartridge can handle glazing, kitchen, bathroom and general interior sealing,
  simplifying stock and saving time.
• Long‑term flexibility and durability
  Cured sealant remains elastic and resilient, accommodating building movement
  and temperature changes without cracking.
• Strong adhesion on smooth, non‑porous surfaces
  Excellent choice for glass‑to‑frame, tile‑to‑sanitaryware and metal‑to‑metal
  joints where adhesion and water resistance are critical.
• Waterproof and weatherproof joint
  Provides a watertight seal that resists rain, splashes and cleaning, helping
  to protect substrates from moisture ingress.
• Easy to apply, smooth and clean
  Good tooling properties enable neat, professional‑looking joints with minimal
  clean‑up when applied correctly.

Frequently Asked Questions – Soudal Multi Purpose Silicone

1. What is the difference between Soudal Multi Purpose Silicone and a sanitary silicone?

Sanitary silicones often contain added fungicides to help resist mould and
mildew growth in permanently damp environments such as showers and wetrooms.
Soudal Multi Purpose Silicone is designed as a general purpose acetoxy silicone
for glazing and building joints and may not always include a specialised anti‑fungal
package depending on the exact variant.

For heavily used showers or very damp, high‑humidity areas, Soudal’s dedicated
sanitary/mould‑resistant silicones may be a better choice. Always check the product
label and datasheet to confirm suitability for long‑term wet area use.

2. Can I paint over Soudal Multi Purpose Silicone?

Generally, no. Like almost all acetoxy silicone sealants, Soudal Multi Purpose
Silicone is not paintable with standard decorative paints. Paint will usually form a
skin that does not adhere well and may flake or crack. Choose the correct colour
of silicone to match or complement the surface instead.

If a paintable sealant is required, consider using a hybrid polymer or acrylic
sealant specified as paintable, and follow the manufacturer’s instructions.

3. Is Soudal Multi Purpose Silicone suitable for use on natural stone or mirrors?

Standard acetoxy silicones are generally not suitable for natural stone such as
marble, granite or limestone because they can cause edge staining or discolouration.
They are also not always suitable for mirror backing, as the acetic acid can
attack the silver layer, leading to desilvering.

For these applications, use a neutral cure silicone specifically labelled for stone
or mirror use from Soudal’s specialist range and follow the datasheet guidance.

4. Can I use Soudal Multi Purpose Silicone externally around windows and doors?

Yes. Soudal Multi Purpose Silicone has excellent weather and UV resistance and
can be used for external perimeter sealing on non‑porous substrates, such as:

• Glass to frame joints
• uPVC and aluminium window and door frames
• Metal trims and claddings

Ensure the surfaces are properly prepared, and joints are designed according to
good practice (allowing for movement, drainage and protection from standing water).

5. What cleaning products can I use once Soudal Multi Purpose Silicone is cured?

Once fully cured, the silicone forms a chemically resistant, waterproof rubber
that can typically be cleaned with:

• Mild household detergents and non‑abrasive cleaners.
• Soft cloths or non‑scratch pads.

Avoid strong abrasive powders, aggressive solvents or sharp tools that could damage
the silicone surface or the substrate. For heavy contamination, always test the
cleaner on a small area first.

6. Common Uses & How to Use Soudal Multi Purpose Silicone

Common Uses:

• Sealing around baths, basins, showers and kitchen sinks (subject to sanitary suitability).
• Perimeter sealing between window/door frames and glass or tiles.
• General interior corner and junction sealing in tiled and non‑porous areas.
• Light exterior joints around frames, fascias and soffit trims.
• Glazing internal and some external glass‑to‑frame joints on compatible systems.

How to Use – Step‑by‑Step:

1. Read the product label and Safety Data Sheet (SDS) to confirm suitability and safety requirements.
2. Remove any existing failing sealant and thoroughly clean and dry the joint area.
3. Apply masking tape if required for sharp, straight edges.
4. Cut the cartridge tip, attach the nozzle and trim the nozzle at an angle to the desired bead size.
5. Place in a sealant gun and apply a continuous, even bead into the joint, ensuring complete contact.
6. Tool the bead immediately using a wetted spatula or profiling tool to compact the sealant and achieve a smooth finish.
7. Carefully remove masking tape while the sealant is still wet.
8. Allow the sealant to cure fully before exposing to prolonged water contact or movement.