Overview

Stock up with this box of 12 HB42 Ultimate Decorators Caulk cartridges - a smart choice for tradespeople and busy decorators who get through caulk regularly. Formulated with 12.5% flexibility, more than double that of many leading brands, this one-part emulsion sealant is built to move with your joints rather than crack under pressure, giving you a seal that lasts.

Once exposed to air, it cures into a durable, flexible finish that fills gaps deeper and wider than standard caulks, and can be overpainted in as little as 1 hour - keeping your projects moving without unnecessary downtime. Suitable for both interior and exterior applications, each cartridge is formulated with a fungicide to help keep seals cleaner and mould-free for longer. The product is CE marked and meets EN ISO 11600 F 12.5P, as well as BS EN 15651 Type F-EXT-INT standards for perimeter frame and joint sealants.

Box contains 12 cartridges - ideal for trade use or larger projects
Outstanding flexibility of 12.5%, more than double many competitor caulks
Handles wide, deep joints - up to 25mm wide and 20mm deep
Overpaintable in as little as 1 hour for faster job turnaround
Fungicide included to help resist mould growth
Suitable for use both indoors and outdoors
Paints or wallpapers over cleanly - a versatile go-to sealant for decorators
CE marked, compliant with EN ISO 11600 F 12.5P and BS EN 15651 Type F-EXT-INT

Limitations: Avoid application below 5°C or in areas subject to constant water immersion.

Area	Interior & Exterior
Recommended Use	Sealing gaps around window and door frames Sealing gaps in skirting boards and coving Sealing gaps in plasterboard General sealing of internal fixtures All-purpose sealing before painting or papering
Base	Blend of acrylic polymers and selected fillers
Drying Time	Tack free time: 15 minutes - 1 hour Full cure: 1 week
Re-Coat Time	Overpaint in 1 hour
Application Method	Cartridge gun

Preparation

Ensure surfaces are clean and free from loose material, standing water or contaminants that could impair the bond.
Clean non-porous surfaces such as aluminium with a suitable cleaning product.
For joints subject to movement (e.g. construction joints), ensure minimum dimensions of 6mm x 6mm, with a maximum of 25mm wide by 12mm deep.
Use a suitable backer rod to reduce depth in deeper joints.
For perimeter pointing where a fillet is to be applied, ensure a minimum measurement of 10mm across with a minimum depth of 6mm.

Application

Ensure joints are properly prepared before application.
Apply the caulk firmly into the joint using an application gun, ensuring a good, solid fill.
Tool the caulk to the required finish once applied.
Apply slightly proud of the required level, as a degree of natural shrinkage will occur during drying.
Overpaint after approximately 1 hour, once tack free.

Tip: Since some shrinkage occurs as the caulk dries, apply it slightly proud of the surrounding surface for the neatest finished result.

Aftercare & Storage

Allow the caulk to become tack free (15 minutes to 1 hour depending on conditions) before disturbing the surface.
Optimum performance is achieved within 1 week, depending on joint dimensions and ambient conditions.
Avoid exposing the sealant to sub-zero temperatures during curing, as this can affect the emulsion system.
Once cured, the fungicide content helps discourage mould growth in the sealed joint.

Clean Up

Clean surrounding surfaces and tools with water while the caulk is still wet.
Wipe away excess uncured material promptly with a damp cloth.
Once cured, the caulk will need to be removed mechanically, such as by scraping.