For sealing around a double-glazed unit, choose a silicone made for glazing rather than a general-purpose bathroom sealant. It needs to adhere to the materials in the installation and remain flexible as the joint moves.
Our pick for glazing work is Parasilico Pro Glass Silicone Clear 310ml. It’s a neutral-curing sealant that Ace Fixings lists for sealing insulated glazing units. Its product description also highlights adhesion to glass, PVC, aluminium and metal, plus resistance to UV, weathering and ageing. If clear isn’t the finish you need, the range includes white, black and anthracite 7016.
Sealing the glazing or sealing the frame?
These are different jobs. If you’re sealing the joint around the glazing, start with a product whose stated applications include insulated glazing units, such as Parasilico Pro Glass Silicone.
If you’re sealing the perimeter around a window frame, Parasilico AX LMN Silicone is another option: its listing specifically mentions perimeter joints around window frames. Check the product listing before ordering, as Ace Fixings notes that this stock is being phased out and orders may contain either the existing or replacement version.
Can silicone fix condensation between the panes?
No. If moisture is trapped between the panes, applying silicone around the visible edge won’t repair the insulated unit’s failed seal. That calls for an assessment of the glazing unit, rather than another bead of sealant.
The takeaway
For a glazing seal around a double-glazed unit, Parasilico Pro Glass Silicone is the clearest match in the Ace Fixings range based on its listed applications. For a joint around the window frame, choose a sealant specified for perimeter joints instead. Always check the product guidance against the exact materials and joint you’re sealing before applying it.