Everbuild 450TR Everflex 450 Builders Silicone Translucent 300ml (6 Pack) Everbuild Everflex 450 Builders Silicone is a premium quality low modulus non-corrosive neutral cure silicone sealant that adheres to virtually all substrates, both porous and non-porous. Typically used for construction expansion joints and perimeter pointing of all types of door and window frames. 450TR Applications: - Perimeter pointing internally and externally around PVCu /wood and all other window frames - Sealing and as an adhesive onto PVCu, plastic trims and components - Bedding insulated glass units in accordance with relevant clauses of BS8000 Part 7 - Suitable as an expansion joint sealant - Weather sealing and joint sealing to pre-formed panels - Sealing soft metals such as.