Detail Product

Bostik XTREME FLEX White Carton of 12

: Silicone and Sealants

XTREME FLEX - High Performance MS Sealant & Adhesive

Bostik Xtreme Flex is a high performance, universal sealant and adhesive based on MSP (Modified Silyl-Polymer) technology. Xtreme Flex cures with the aid of atmospheric humidity to form a durable elastic rubber.

Recommended Uses

Xtreme Flex can be used internally and externally as a general purpose sealant where advanced flexibility is desired. It is suitable for sealing to damp substrates or in wet conditions, and for food storage and coolrooms. Ideal substrates include:

  • Concrete/Stone/Ceramic
  • Glass
  • Plasterboard
  • Polyurethane
  • PVC
  • Hard Plastics
  • Enamel
  • Copper/Lead/Zinc
  • Aluminium (including COLORBOND® and ALUCOBOND®)
  • Metals/Alloys/Stainless Steel
  • HPL
  • Cement Fibre Panels
  • Wood & Paint Systems

Product Details

  • Universal sealant and adhesive
  • Interior and exterior use
  • UV resistant
  • Paintable
  • WaterMarkTM certified WMKA2528/WMTS-014:2016
  • Water potable (Water Potable to AS4020)
  • Moisture and mould resistant
  • Adheres perfectly without primer on most surfaces
  • No shrinkage and bubble free
  • Adheres even to damp surfaces
  • Remains permanently elastic
  • Neutral curing
  • Almost odourless
  • Non corrosive towards metals
  • High mechanical resistance, end strength and E-modulus
  • Absorbs acoustic and mechanical vibrations
  • Environmentally friendly
  • Low VOC

Discover the Xtreme sealants and adhesives range, including Xtreme High Tack  and Xtreme ClearFix.


To ensure that tiles are installed correctly, please consider using a tiling professional. All Natural Stone and Encaustic tiles should be sealed immediately after install.


To ensure long lasting, beautiful tapware, please do not use any chemical based or harsh cleaners. Also avoid any rough surface materials such as scourers, only use a soft cloth with warm soapy water.


We deliver Australia Wide baby! To estimate delivery time to your beautiful home, see our Shipping info here.


To ensure that our product is perfect for you, before purchasing please consider reading our Refunds and Returns Policy here.