125 One Hour Caulk C3 everbuild

125 One Hour Caulk C3

Suitable for interior and Exterior

Product Description

EVERFLEX ONE HOUR CAULK is a fast drying flexible decorators filler and sealant which can be overpainted with all paint types, or covered over with wallpaper.  No sanding down is required.




·       Fast drying - can be overpainted in 1 hour.

·       Permanently flexible.

·       Easy water clean up.

·       Excellent slump resistance.

·       Certified to the harmonized European standard EN15651 for façade use internally in compliance with the Construction Product Regulation.

Code Product Boxed In
080033 125 One Hour Caulk C3 1

Areas For Use

·       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 fixtures adjoining walls.

·        Can be used to fill damage plaster.




·       Not for use in conjunction with bitumen or asphalt.

·       Do not attempt to abrade when cured.

·       Do not overpaint until a surface skin has formed.

·       Note: this product is a flexible. Certain poor quality paints (especially certain vinyl matts) have very little movement in the dry film. It is possible for the dry paint film to crack if movement is excessive.

·       For internal use only



Surface 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 Caulk with water at a ratio of 1:2.  Can be applied to slightly damp surfaces.





Cut the tip of the cartridge taking care not to damage the thread.  Apply nozzle and cut cleanly at an angle of              45’ with an opening slightly larger than the gap to be sealed.  Apply using a standard sealant gun.  Best results will be obtained by keeping an even pressure on the gun trigger and keeping the gun at a constant angle to the  surface being sealed. Smooth down within 20 minutes of application using a wetted spatula, piece of wood or wetted finger.  Care should be taken at this point not to saturate the surface as this will delay drying.  Any excess sealant etc., can be removed using a sponge and warm water.  Can be overpainted after @ 1 hour.



Specific Data


Ready to use thixotropic paste

Specific Gravity

1.62 – 1.70

Elongation at Break (%)

>100%  to ISO8339

Hardness (Shore A)

Approximately 50

Tack Free Time

15 to 60 mins, dependent on thickness, ambient temperature and humidity

Full Cure

3 to 5 days, dependent on thickness, ambient temperature and humidity

Solids Content


Slump Resistance

No slump to ISO 7390

Application Temp. Range

+4°C to +40°C

Service Temp. Range

-15°C to +75°C

Chemical Resistance

Dilute Acids  - Fair                               Dilute Alkaline - Fair

Aliphatic Hydrocarbons - Fair              AromaticHydrocarbons - Poor

Movement Accommodation

Low to medium (+/- 5%)


Up to 10 years when used as recommended

Shelf Life

Up to 36 months when stored in unopened cartridges under cool dry

conditions.  AVOID FROST


Can be used in contact with most building and decorating materials but

should not be used against bituminous materials.


Should not be used in conditions of continuous immersion, below ground level, in areas of high abrasion (e.g. floor joints).



Health & Safety

Consult MSDS for full list of hazards




Store in cool dry conditions and protect from frost. 



Shelf Life

36 months from date of manufacture

File Download
125 One hour caulk rev 6.doc
125 One Hour Caulk SDS v3.13.pdf