LED Strip Tape on Ceiling - Sticking Plasterboard to Plasterboard

[DaveFix]

I'm about to put up a new ceiling and would like to fit LED strip tape around the edge, about 25cm from the wall. The strip tape will sit behind a silicone diffuser such as eBay item https://www.ebay.co.uk/itm/266101406404

The diffuser has a depth of 8mm, so I'm thinking of using 9.5mm plasterboard and cutting out the channel before fitting. The channel needs to be 10mm wide. To bridge the back of the channel, I'm thinking of gluing strips of plasterboard so that it remains one rigid piece, and for sticking the LED tape on this. It's a hallway so I'm planning to use tapered edge boards (and will not be skimming).

What I'm least sure about is when it comes to sticking the plasterboard to plasterboard (for bridging the back of the channel). Obviously I need it tight together, so not bonding compound. As it'll be about 8 meters, superglue would work out very expensive. I'm thinking about a tube of "No More Nails" (or similar brand).

What would bond plasterboard to plasterboard best?

Also, if anyone has installed an LED diffuser in a ceiling before - any pitfalls to look out for?

 

[foxhole]

Coving adhesive .

 

[Wayners]

I'd go with a polymer grab myself.
I like stixall white

Could used board adhesive or easyfill 20 but I think the polymer is easy to use with high grab.

 

[oldbutnotdead]

As a matter of interest, how are you going to cut this channel of which you speak?

 

[DaveFix]

As a matter of interest, how are you going to cut this channel of which you speak?

I'm planning to put the boards up against the joists using plasterboard support rods, get them to fit then mark everything out. Bring them back down and cut the 10mm channel with a Stanley knife, then bond plasterboard strips over the channel with:

Supercove Supercove Coving Adhesive White 310ml - Screwfix

Order online at Screwfix.com. Ready to use, water-based white adhesive filler. Easy to apply with standard sealant gun. Installs up to 6m of coving. Less mess than powder mixes, easy to clean off with damp sponge. Fully paintable once cured. FREE next day delivery available, free collection in 1...

www.screwfix.com

The silicone diffuser has a 2mm lip each side so it's a bit forgiving if my cuts aren't perfect.

 

[oldbutnotdead]

Hmm. Sounds fairly ambitious- have you done any test cuts yet? Generally when you use a Stanley on plasterboard you aren't cutting the plaster, just the paper- the plaster then snaps cos nothing is supporting it. Whittling plasterboard with a Stanley is not a precision exercise.
I'd suggest getting a gash lump of plasterboard and having a go before you commit to it too far. If I was doing it I'd be finding a cheap 10mm router cutter and trying that. Or even a circular saw with a cr*p blade and a depth stop.