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**Chris** · 25-08-2021, 07:55

^This.

It sounds like you painted your wall with Teflon. (Or more likely it’s a vinyl finish wallpaper or a kitchen wall with a film of grease on it). You need to prepare your surface properly. That means giving it a savage cleaning, a brief, rough sanding, another clean to remove dust, and then try glueing again.

Also be aware that dangling cables from your extension lead, including its own cable, will apply force to it - the power supply in particular will apply a rotational force (torque) that may be surprisingly strong and could overcome the strength of the glue even before it has a chance to cure. You need to make sure the whole assembly is fully supported while the glue dries and ideally the power supply cable should be neatly finished with cable clips against the wall.

25-08-2021, 07:55	#7
Chris Trollsplatter Cable Forum Team Join Date: Jun 2003 Location: North of Watford Services: Humane elimination of all common Internet pests Posts: 36,938	Re: DIY Question ^This. It sounds like you painted your wall with Teflon. (Or more likely it’s a vinyl finish wallpaper or a kitchen wall with a film of grease on it). You need to prepare your surface properly. That means giving it a savage cleaning, a brief, rough sanding, another clean to remove dust, and then try glueing again. Also be aware that dangling cables from your extension lead, including its own cable, will apply force to it - the power supply in particular will apply a rotational force (torque) that may be surprisingly strong and could overcome the strength of the glue even before it has a chance to cure. You need to make sure the whole assembly is fully supported while the glue dries and ideally the power supply cable should be neatly finished with cable clips against the wall.