Nationwide Delivery

Knowledgeable Staff

Outstanding Service

Secure payments

Bond-It Build-Mate Oil Based Mastic Sealant - 310ml (Box of 12)


£38.30 Incl. VAT
£31.92 Ex. VAT

Pay in 3 interest free payments with PayPal on checkout. Choose PayPal at checkout. Learn more
Estimated Delivery: 2-3 working days 


The Build-Mate is an oil-based mastic sealant from adhesion specialists, Bond-It. Designed for exterior use, the low-toxicity Build-Mate adheres with most common building materials. Ideal for sealing and bedding metal or wood window and door frames, the Build-Mate mastic sealant can also be used for the maintenance of low-rise building joints, seals, and flashing, and for pointing around precast building materials.

The Build-Mate does not sag over time and does not harden under its self-repairing skin. Once cured, the mastic sealant can be painted over with an oil-based paint to match any aesthetic.

For best results ensure all surfaces are clean, dry, and free from dust or oil before application. In order to protect its shelf life, the Build-Mate mastic sealant should be stored in cool, dry conditions and protected from frost.

Why Choose the Bond-It Build-Mate Oil Based Mastic Sealant - 310ml?

  • Bonds with most common building materials
  • Tough, elastic seals & joints
  • Helps dampen vibration
  • Chemical & oil resistant

Product Specifications:

Colour: Brown / Stone / White (select from dropdown)

Size: 310ml

Flammability: Flammable

Sag: None

Joint Movement Accommodation: +/- 5% from mean position

Movement Joint Design: Min depth 12mm (1/2”), max width 25mm (1”)

Filling: Min depth 4mm, min width 10mm

Please note: Do not use on bitumen or asphalt or where joint movement exceeds 5% of mastic area. Not suitable for use on uPVC.

Deliveries are made on the basis the customer can accept the goods, or willingness to off load the goods, or having means of mechanical offload, this also applies to heavier items such as pallets etc. All deliveries are made ‘kerbside’ and often it can be at the discretion of the driver. A large majority of deliveries would be made on a large rigid tail-lift vehicle and off loaded via a pallet truck and only on to flat surfaces such as tarmac, concrete and pavers. If you do have restricted access, please contact us prior to placing your order. We will always try to accommodate your needs. If a delivery fails due to access, we reserve the right to make a re-delivery charge. All delivery charges are calculated when checking out. The delivery charges included are for the Mainland UK only and do not apply to the Scottish Highlands, or Isles off the Mainland. Additional charges may apply for deliveries that aren’t classed within the Mainland (this is classed by ourselves, suppliers and couriers) Please contact us on 01752 466151 or Due to the nature of our business model, this can mean your order will be sent via multiple deliveries. Whilst we will make every effort to deliver your goods within the stated/requested time frame, we cannot guarantee availability from the manufacturer or the manufacturer's delivery schedules, so we would recommend the end user not to start/schedule any work until the goods arrive. Due to logistics of various couriers and suppliers we are unable to give times of deliveries. However, please call or email us on the day of the delivery and we will try to get an approximate time. Deliveries can take place from as earlier as 07:30 right up to 18:00 depending on the courier/haulier and taking into account local traffic etc.
You have 14 days from receiving your item(s) to return them should you wish to do so. Please contact us should you wish to arrange a refund/return. Any bespoke items such as cut to size lead, cut to size sheets and coping stones are all made to order and are non-refundable.

Have a Question?

Be the first to ask a question about this.

Ask a Question

Payment & Security

Apple Pay Google Pay Maestro Mastercard PayPal Shop Pay Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.