How do you apply Soudal Soudatight SP?

Apply it undiluted using airless spray equipment in at least 2 layers.

Can Soudatight SP be painted or plastered over?

Yes, once fully dry, the seamless membrane can be painted or plastered over directly.

Is this product suitable for roof applications?

No, it is designed for wall, floor, and window connections, not for roof applications.

What is the difference between Soudatight SP and LQ?

Soudatight SP is sprayable for larger surfaces. Soudatight LQ is fibre-reinforced and brush-applied for details.

SOUDAL Soudatight SP air- and vapour-tight membrane black 11 kg - 145787

Name: SOUDAL Soudatight SP air- and vapour-tight membrane black 11 kg - 145787
Brand: SOUDAL
SKU: 03213545
Price: 120.6 EUR
Availability: PreOrder

Supplier number: SOUDAL 145787 | EAN 5411183161252

Recommended Retail Price €141.31

120.60 tax incl.

€99.67 excl. VAT (incl. all environmental contributions)

On order: delivered from 21/10/2026

Ordered before 20:00 - delivered as of 21/10/2026
Shipping costs €6.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

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Reliable airtight sealing with Soudal Soudatight SP

Practical benefits

Seamless and flexible membrane: You create an airtight and vapour-tight barrier that remains permanently elastic across structural joints and surfaces.
Fast and easy spraying: You apply the liquid coating evenly over large internal surface areas using professional airless spray equipment.
Ready for direct finishing: Once fully dried, you can easily paint, plaster, or tape over the coated surface without complications.

In a nutshell

The right choise for

With the Soudal Soudatight SP, you quickly and reliably create a seamless, flexible barrier against air leaks and vapour transmission. This liquid sealing coating is applied evenly using professional airless spray equipment, making it ideal for covering large surface areas, window reveals, and joints between floors, walls, and ceilings. The membrane delivers strong adhesion to porous construction substrates such as concrete, masonry, plaster, and wood. Once fully cured, the layer remains permanently elastic and provides a stable base that you can paint, plaster, or tape over directly to achieve dependable, airtight building connections.

Product information FAQ

€120.60

tax incl.

Key features according to our expert

Weight: 1 kg
ADR packing group: Not applicable
UN number: Not applicable
ADR class: Not applicable
EUH-statements: EUH208; EUH210
Physical state: Liquid

Product description:

Soudatight SP is the sprayable version of Soudatight LQ, only the glass fibres are logically omitted. This product can be very easily and quickly sprayed to form a liquid, air- and vapour-tight membrane on larger surfaces and on the connections between these surfaces (floor-wall, wall-ceiling, etc.). Forms a seamless elastic membrane after drying, which is an ideal base for painting or plastering. Best used in combination with Soudatight LQ for optimum results. Soudatight SP is applied using airless spray equipment.

Properties:

Air- and vapour-tight
Very good adhesion to many porous materials
Good adhesion on slightly damp substrates
Permanently elastic after curing and very durable
Can be painted over and plastered after drying
Complies with GEV-EMICODE EC-1 PLUS: very low emission

Applications:

For air- and vapour-tight finishing of window connections, wall-floor connections, wall-ceiling connections and surfaces (no roof applications).

Instructions for use:

Make sure that Soudatight SP is at room temperature before use. Shake or stir well before use. Soudatight SP is applied to the substrate using airless or air-assisted spraying equipment directly from the packaging. The choice of spraying equipment, pressure, gun and spray tip depends on the application. Contact Soudal for further tailor-made information. Apply the air sealing paste undiluted and evenly in several layers (at least 2) to the substrate to a layer thickness of minimum 1 mm and maximum 3 mm. For best coverage, apply the product at a different angle the second time. It is recommended to apply the 2nd coat only after skin formation occurs with the first coat. The application thickness should be measured (wet) using a thickness gauge. For window applications ensure that the airtightness paste forms a seamless membrane of at least 3 mm on the window frame, over the flexible foam up to ± 5 cm on the day side of the building shell. The use of masking tape (on the window frame) is recommended. However, this should be removed shortly after application of Soudatight SP, before curing. For wall connections, ensure that the airtightness paste forms a seamless membrane of ± 15 cm on both surfaces. Before curing, Soudatight SP can be removed from materials and tools with water.

Supplemental hazard information

EUH208: Contains ... (see safety data sheet). May produce an allergic reaction.
EUH210: Safety data sheet available on request.

All Features

Weight: 1 kg
Adr packing group: Not applicable
Un number: Not applicable
Adr class: Not applicable
Euh-statements: EUH208; EUH210
Physical state: Liquid
Colour: black
Packaging form: Bucket
Product content: 11 kg

Brand SOUDAL
03213545
EAN 5411183161252
Supplier number SOUDAL 145787

Frequently asked questions about this product

Answered by specialists

How do you apply Soudal Soudatight SP?: Apply it undiluted using airless spray equipment in at least 2 layers.
Which surfaces does this liquid membrane adhere to?: It adheres well to porous construction substrates such as concrete, masonry, plaster, and wood.
Can Soudatight SP be painted or plastered over?: Yes, once fully dry, the seamless membrane can be painted or plastered over directly.
Is this product suitable for roof applications?: No, it is designed for wall, floor, and window connections, not for roof applications.
What is the difference between Soudatight SP and LQ?: Soudatight SP is sprayable for larger surfaces. Soudatight LQ is fibre-reinforced and brush-applied for details.