Flexible filler for cracks under bay window

[Lower]

I'm need to repair some cracks under a bay window. Unfortunately, it's a 1920's house, an upstairs bay and the plaster is attached to brickwork that has been built off the floorboards. There's always going to be some movement, but surprisingly little. The cracks are slightly more than hairline, and always reoccur in the same place.

Can anyone recommend a filler that's got some flex in it that might be suitable? I'm resigned to there always being some movement, but i want to minimise the cracking if possible.

 

[Wayners]

Lining paper to cover?

 

[Lower]

Hadn't considered lining paper. Might be a good shout in reality but the rest of the room is painted plaster so my wife isn't keen on the bay having a different texture and paper lines.

 

[securespark]

Use one of the thinner lining papers and take the paper into the corners where the bay meets the walls at either end. Then put a thin line of caulk between the paper and the wall, and it should conceal it well.

Once it's all covered in emulsion, you shouldn't notice a difference.

Or, if Mrs Lower is anti-paper, just try a flexible filler.

 

[foxhole]

Repair tape , very thin , so disappears under a few coats of emulsion.
Look at this product that I found on google.com
https://g.co/kgs/63syzfN

 

[Lower]

Use one of the thinner lining papers and take the paper into the corners where the bay meets the walls at either end. Then put a thin line of caulk between the paper and the wall, and it should conceal it well.

Once it's all covered in emulsion, you shouldn't notice a difference.

Or, if Mrs Lower is anti-paper, just try a flexible filler.

Its a 4 bend bay and unfortunately the position of the cracks is in a place where the isn't a decent corner anywhere near to finish the paper in. Elsewhere in the house we have a similar bay arrangement with cracking in the same place. We had the bay windows replaced and bay polls installed which have helped reduce the movement, but the easifil i used has still cracked slightly, though nowhere near as badly as it was before. Hence asking for a flexible filler, but ideally one that's sandable as opposed to calk.

 

[Lower]

Repair tape , very thin , so disappears under a few coats of emulsion.
Look at this product that I found on google.com
https://g.co/kgs/63syzfN

that look's interesting, dependent on how invisible it becomes when painted. Got to be better than cracks though!

 

[foxhole]

that look's interesting, dependent on how invisible it becomes when painted. Got to be better than cracks though!

It’s so thin I accidentally used it double thickness .

 

[opps]

With extremely thin cracks, absent of any bounce when pushing the plaster either side of the crack, PVA brushed in can lock the plaster in place. Wipe away the excess and use a fine filler.

Larger cracks, I rake them out and fill with Toupret Flex and Fill. It shrinks back though (it is like a caulk with tiny fibers in it). I then fill over the top with a different filler and sand that back.