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Bonding silicone rubber requires careful adhesive selection, as not all glues will stick effectively. Using the right adhesive is key to achieving a secure, durable bond for your craft, repair, or mould-making project.
Choosing the Right Adhesive
Most general-purpose glues, including common super glues and epoxy, are unsuitable for silicone rubber. Instead, use adhesives specifically designed for silicone—these include silicone-based adhesives or certain RTV (Room Temperature Vulcanising) silicones. These products are formulated to bond to the low-energy surface of silicone, ensuring a better hold.
If you’re working with silicone products such as silicone putty for mould making, make sure to use adhesives recommended by the manufacturer or labelled as suitable for silicones.
Application Tips for Reliable Bonds
Surface preparation makes a difference, even when using the correct adhesive type. Ensure both silicone surfaces are clean, dry, and free from dust or oil. Some adhesives may benefit from lightly abrading the surface for enhanced grip—check product guidelines first. Apply adhesive sparingly; too much can weaken the bond. Clamp or hold the pieces together until cured, following the adhesive’s instructions for setting time.
When the Right Adhesive Matters
Choosing a suitable silicone adhesive is crucial when assembling moulds, sealing joins, or repairing custom silicone items. An inadequate bond can cause leaks, splits, or failures in your finished project. For example, when crafting a silicone mould—such as with products like non-toxic silicone putty—even a small gap can affect mould performance.
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Picking the proper adhesive ensures a strong, lasting bond with silicone rubber. For more practical advice and mould-making tips, visit our main guide on how to glue silicone rubber.