Render cracks

Sillytoe

We have hairline cracks in external wall of house. Only the one wall rendered; the rest brick. As the majority of the cracks emanate from edge of lintels, I think cracks are due to minute house movement over time against a very hard render.
Could anyone recommend a render mix/filler that is flexible and would accommodate small movements so cracks do not reappear in a year or so?

FreeBear

I've heard good things about Toupret exterior filler, although I've not used it myself.

Lorian

I've tried a lots and toupret external even though it's not flexible works really well for this application. It's a little expensive but comes as powder and you can mix just enough to do the job and put a clipit on the bag.

Not the best time of year to be filling them though but it will work on a dry day but it sets slower in the cold. 

If you fill cracks a little proud then go back after 1-4 hours you can lightly run a sponge over it to finish and avoid hardly any sanding.

Has the advantage of not grinning through paint like many fillers.

jonnydeppiwish!

How big are the cracks? If they are just hairline, the use a flexible paints such as this https://www.promain.co.uk/extra-flex-masonry-paint.html
Our builder used the wrong sand for the render and scarpered once the hairline cracks appeared. It works really well as it flexes over the crack.