Osmo Gap Sealer - 310ml Tube

Osmo Gap Sealer is an acrylic sealer ideal for sealing and filling joints on interior wood, PVC, iron and aluminium joinery. The perfect sealer for your joinery products as it can be sanded after curing and treated with Osmo finishes after only 1 hour. Formulated to be resistant to air conditions and stay elastic to stop cracking or shrinkage.

• Can be treated with Osmo finishes
• Permanently water repellent after curing
• Resistant to air conditions, stays elastic
• Can be sanded
• Based on 3mm gaps a 310ml tube will fill in excess of 30 linear metres

We recommend to use the Osmo Application Gun for easy application.

Always ensure the surface to be treated is clean, dry and free from any dust or grease.

• No primer is required for non-porous surfaces.
• On porous surfaces such as concrete, stone, cement and plaster a primer (a mixture of one part acrylic sealant and 4-5 parts of water) can be applied.

Always do a test area to ensure you are happy with the finished product.

• Cut the dome of the tube with a sharp knife, taking care not to damage the thread.
• Attach the nozzle, cut the end of the nozzle at an angle and size to suit application.
• Application temperature is between 5°C - 40 °C.
• Osmo Gap Sealer can be applied to gaps and joints of between 5mm – 25mm.
• Immediately after application, smooth sealant with a wet finger or a wet tool.
• Excess sealant can be removed with a damp cloth.
• The sealant should be left to dry for at least 2 hours.
• Product will be cured after 24hours and can be sanded.

Note: Always follow the manufacturer instructions found on the tin.

Q. Does Osmo Gap Sealer dry hard?

A. The Osmo Gap Sealer is resistant to air conditions and stays elastic to stop cracking or shrinkage.

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 on 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

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

AM Delivery - £12.99

Order by: 2pm, Monday - Sunday

Expected delivery: Next working day by 2pm

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

Late Cut-Off - £5.99

Order by: 4pm, Monday - Friday 

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

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

Saturday Delivery - £9.95

Order by: 2pm, Friday 

Expected delivery: Saturday, 8am - 9pm

Standard Delivery (Out of Zone Postcodes Only) - £6.99

Order by: 3pm, Monday - Sunday 

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

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.