Product Data Sheet Show all documents
Sika® Caulk Once

Sika® Caulk Once

Premium quality acrylic caulk

Sika® Caulk Once is a premium quality acrylic caulk, manufactured using an advanced high quality polymer to offer superior adhesion, low shrinkage and smooth tooling. Caulk Once is fast-drying and remains permanently flexible, allowing it to be over-painted or covered with wallpaper in just 1 hour, saving the user valuable time.

  • Fast drying - can be over-painted in 1 hour.
  • Permanently flexible.
  • Easy water clean up.
  • Excellent slump resistance.
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Product Data Sheet Show all documents

Usage

  • For sealing and filling cracks and gaps prior to decorating.
  • For use around skirting boards, ceiling cornices, window and door frames, stair treads and risings and gaps between fixtures and adjoining walls.
  • Can be used to fill damaged plaster.
 

Advantages

  • Fast drying - can be over-painted in 1 hour.
  • Permanently flexible.
  • Easy water clean up.
  • Excellent slump resistance.

Packaging

295 ml and 380 ml cartridges

Colour

White

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • Conforms to ISO11600 F12.5P.
  • Certified under the harmonized European standard EN15651 for façade interior and exterior applications in compliance with the Construction Product Regulation.
Product Information

Construction

Paste

Shelf Life

Use within 3 years

Storage Conditions

Store in cool dry conditions and protect from frost. Keep product stored between +5 °C to +25 °C.

Density

1.6-1.7 g/cm³

pH-Value

8.5-9.5

Viscosity

300,000 - 400,000 cP
Technical Information

Shrinkage

<25 % according to ISO10563

Movement Capability

12.5 % EN15651-1

Chemical Resistance

Dilute Acids - Fair
Dilute Alkaline - Fair
Aliphatic Hydrocarbons - Fair
Aromatic Hydrocarbons - Poor

Service Temperature

-15 °C to +75 °C

Application

Application Information

Sagging

No slump according to ISO7390

Ambient Air Temperature

+4 °C to +40 °C

Compatibility

Can be used in contact with most building and decorating materials, should not be used against bituminous materials.

Curing Time

Full cure in 3-5 days

Tack Free Time

15 - 60 minutes, dependent on thickness, ambient temperature and humidity.

Tooling Time

Tool within 20 minutes of application.
Application steps

SUBSTRATE PREPARATION

All surfaces must be clean, dry and dust free. All loose or flaking surface coatings, and old sealant and mastic joints, should be removed before application. Highly porous substrates such as new plaster should first be primed with a dilution of Sika® Caulk Once with water at a ratio of 1:2. Can be applied to slightly damp surfaces.

 

Documents

FAQ

Can I paint over Sika Caulk Once?

Yes, once a surface skin has formed (typically within 1 hour), you can paint over it with most types of paints. However, lower-quality paints, especially some vinyl matt paints, may crack if excessive movement occurs.

How long does Sika Caulk Once take to dry?

Sika Caulk Once dries quickly and can be over-painted or covered with wallpaper in just 1 hour. 

What is the best way to apply Sika Caulk Once?

Please see PDS for full instructions

How should I prepare the surface before applying the caulk?

Ensure surface is clean, dry, and dust-free. Remove any loose or flaking
coatings or old sealants. For highly porous surfaces, prime with a 1:2 dilution
of Sika Caulk Once with water.

Can Sika Caulk Once be used outdoors?

It is primarily designed for interior applications but conforms to EN 15651, making it suitable for façade interior and exterior applications under standard conditions. However, it is not suitable for permanent immersion or use in areas with high abrasion. We recommend use of Weather Mate as an alternative for outdoor applications.

What is Sika Caulk Once used for?

It’s perfect for sealing and filling gaps or cracks before decorating. You can use it around skirting boards, ceiling edges, doors, windows, and even to fix
damaged plaster before painting or wallpapering.

How do I clean up excess caulk?

Excess Sika Caulk Once can be removed with a sponge and warm water before it fully cures. Once dried, removal may require mechanical methods.