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Everbuild 450 Builders Silicone Seal Sealants


  • The Everbuild Range of Everflex 450 premium builders silicone sealants are 310ml sized cartridges that are available in 7 colours - white, brown, clear, black, buff, grey and oak.
  • All these colours will fit most common mastic or sealant guns.
  • Everbuild 450 range of silicone sealants are cost effective low modulus, oxime cure RTV silicone sealants that adhere to a wide range of both porous and non-porous surfaces without the need for priming.
  • Conforms to BS5889.
  • Silicone 450 is formulated as a high viscosity grade to give excellent tooling properties.
  • Cures quickly to provide a permanently flexible, high strength waterproof seal.
  • These sealants remain permanently flexible, forming a tight rubber-like seal, and have a faster curing time than conventional low mod sealants with an extremely low dirt pick up.
  • They are also flexible and waterproof giving a good sound seal for a professional finish.
  • The Everbuild 450 is ideal for perimeter pointing internally and externally around PVCu / wood and all other window frames, sealing and as an adhesive onto PVCu, plastic trims and components.
  • Suitable as an expansion joint sealant or weather sealing and ideal for joint sealing to pre-formed panels, sealing soft metals such as lead, copper and zinc, general glazing sealing, draught proofing, including repair work over existing sealant, glass to glass and glass to aluminium sealing and roof weather sealing applications.


  • Low dirt pick up - important in PVCu work.
  • Excellent flexibility ± 50%.
  • High resistance to plasticiser migration - may be used over water based and solvent based paints.
  • Excellent external weathering properties.
  • Suitable for use on polycarbonate.

Areas For Use:

  • Perimeter pointing internally and externally around PVCu/wood and all other window frames.
  • Sealing and as an adhesive onto PVCu, plastic trims and components
  • Suitable as an expansion joint sealant
  • Weather sealing and joint sealing to pre-formed panels
  • Sealing soft metals such as lead, copper and zinc
  • General glazing sealing and draught proofing, including repair work over existing sealant
  • Glass to glass and glass to aluminium sealing
  • Parapet and roof weather sealing applications.

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Delivery Information

Free delivery on all online orders over £54.99, delivered to the UK mainland only; A small order charge of £6.95 vat is charged on all orders under £54.99 (net). 

Many of our items are available for next day delivery, where items are made to order or not currently in stock delivery times will vary. Please contact us for a confirmed delivery date or alternatively a representative will confirm your order. 

Special delivery services are available; please contact our Sales Office to discuss your specific requirements. 

The following postcodes will be subject to a delivery surcharge: 

AB37 & AB38, AB41-AB56, FK19-FK21, IV1-IV40, IV52-IV54, IV63, JE1-JE5, KW1-KW14, PA21-PA40, PH15-PH41, PH49, PH50, HS, IV41-IV51, IV55 & IV56, KA27, KA28, PA20, PA41-PA78, PH42-PH44 and ZE, This also includes Northern Ireland. Certain products within our range are subject to a delivery surcharge when delivered to additional areas in Scotland than those already listed.

A customer service representive, will contact you upon receipt of your order to advise of the relevant charges or please call us to confirm the surcharge prior to placing your order

If you would prefer to collect your delivery from our warehouse, please select collection at the checkout and we will let you know when your order is ready to collect.

Contact Us for Bulk Discounts

Part Number Description Price
ID 175532
450 Builders Silicone Sealant Clear 310ml

(£6.89) RRP (Ex VAT)

£5.16 (Ex VAT)

£6.19 (Inc VAT)

ID 175533
450 Builders Silicone Sealant White 310ml

(£6.89) RRP (Ex VAT)

£5.16 (Ex VAT)

£6.19 (Inc VAT)

ID 175534
450 Builders Silicone Sealant Black 310ml

(£6.89) RRP (Ex VAT)

£5.16 (Ex VAT)

£6.19 (Inc VAT)

ID 175535
450 Builders Silicone Sealant Brown 310ml

(£6.89) RRP (Ex VAT)

£5.16 (Ex VAT)

£6.19 (Inc VAT)

ID 175536
450 Builders Silicone Sealant Buff 310ml

(£6.89) RRP (Ex VAT)

£5.16 (Ex VAT)

£6.19 (Inc VAT)

ID 175537
450 Builders Silicone Sealant Grey 310ml

(£6.89) RRP (Ex VAT)

£5.16 (Ex VAT)

£6.19 (Inc VAT)

ID 175538
450 Builders Silicone Sealant Oak 310ml

(£8.81) RRP (Ex VAT)

£6.61 (Ex VAT)

£7.93 (Inc VAT)

Estimated delivery is for guidance only, an exact delivery date will be confirmed on your order acknowledgement. Please contact us for further information.We make every effort to ensure that the information provided on this page is accurate, we can not be held responsible for any errors, typography or otherwise. Illustrations and images are representational of typical styles and designs may vary. Prices and specifications may alter without prior notice.

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*Online orders over £39.99 (net) delivered to UK Mainland only. Excluding certain postcodes

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