HB42 Premium Decorators Caulk - White - 380ml - Box of 12

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.

• 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.

• 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.

• 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.

Storage

Store in dry conditions between 5°C and 25°C. Protect from frost.

Q. How soon can I paint over HB42 Ultimate Decorators Caulk?

A. It can be overpainted in as little as 1 hour, once tack free, though full optimum performance is reached within about a week depending on joint size and ambient conditions.

Q. What makes this caulk more flexible than other decorators caulks?

A. HB42 Ultimate Decorators Caulk offers 12.5% flexibility, more than double many leading caulk brands, which makes it more resistant to movement in joints and helps it last longer without cracking.

Delivery - All orders placed on a working day before 3pm will be dispatched on the same day for next working day delivery. Orders placed before 3pm on Friday will be delivered on Monday (excluding bank holidays). Orders placed after 3pm on Friday, weekends and Bank Holidays will be dispatched on the next working day. 

Delivery of Tinted Products - Tinted paints are dispatched in line with our express order process, shown below. However, due to their bespoke nature, please allow up to an additional 5 working days to accommodate any potential courier delays or delivery issues before receiving a refund or replacement.

We strongly suggest customers avoid booking tradespeople until they receive their order. Next Day Paint will not be held liable for any costs incurred due to order processing errors, delivery delays, or other issues that may result in financial loss.

Delivery Options

Express Shipping - £3.99

Order by: 3pm, Monday - Sunday

Expected delivery: Next working day, 8am - 9pm

AM Delivery - £12.99

Order by: 4pm, Monday - Sunday

Expected delivery: Next working day by 4pm

Late Cut-Off - £5.99

Order between: 3-4pm, Monday - Friday 

Expected delivery: Next working day, 8am - 9pm

Extended Late Cut-Off - £7.99

Order between: 4-5pm, Monday - Thursday

Expected delivery: Next working day, 8am - 9pm

Saturday Delivery - £9.95

Order by: 4pm, Friday 

Expected delivery: Saturday, 8am - 9pm

Standard Delivery (Out of Zone Postcodes Only) - £8.99

Order by: 3pm, Monday - Sunday 

Expected delivery:  3-5  working days, 8am - 9pm

Note: Orders placed on weekends or bank holidays will be dispatched on the next working day for delivery on the following day

We do not deliver to the Channel Islands or the Republic of Ireland

Certain postcodes delivery times and charges may vary please head to the cart to see your available delivery options.

Returns

We offer a 14 day money back guarantee for all goods shipped correctly that are not required. If the item is not required, please send the item back for a full refund in its original condition, unused with its original packaging. Please note return for unwanted item is at your own expense.

Contact us as soon as possible to inform us you will be returning the product either by a contact form or by calling our team on 0161 960 0217.

All tinted paint purchases are final and non-refundable. If you're unsure about your selection, please refer to the product listing or contact us for guidance before ordering. Once mixed, tinted paints cannot be returned or refunded, regardless of delivery delays or changes in circumstances.

While we aim to meet delivery timelines, we are not responsible for delays caused by couriers, weather, or other external factors.

We recommend ordering samples or colour charts before purchasing. While we strive to represent colours accurately, screen settings and surface types can affect appearance. Opened tins cannot be returned due to dissatisfaction with colour.

For non-tinted products, we offer a 14-day money-back guarantee. Items must be returned unused, in original condition and packaging, at your own expense.

Damaged Paint

Please visit our damages page, where we can help resolve the issue for you. 

Incorrect Item

If we have sent you a different item from what you ordered, we will be happy to organise an exchange for the correct goods at no extra charge to yourself, please get in touch to organise this.

Faulty Items

Faulty items can be refunded or exchanged within 30 days. All returns are tested, and if no fault is found, no refund will be issued you'll have the option to have the item returned. For faults discovered after 30 days, please contact the manufacturer for further support.