Repairing cracks in external render

[sam]

My 1930s house was re-rendered in the 1980s and now has some cracks. I tried filling some of the cracks with Polycell Quick Set Cement but the cracks reappeared in the same place some months later.

 

Can anyone recommend a product which would be better suited to repairing this? I'm wondering if something not cement based which is slightly flexible would be more appropriate.

 

Thanks

[Nickfromwales]

Sika do a system for exactly that

Demo here

[sam]

Thanks - I'll try it.

[mafaldina]

Toupret Murex (Toolstation do it, other outlets are also available) works. You will nee to angle grind the crack to make it wider and try and undercut the fissure a bit. The trick is to overfill a bit and feather out over the surface and get as smooth as possible. It sets relatively quickly. I damp sponge over as well. You might have to orbital sand back a tad when it has set, don't leave too long. It will never be perfect but you can get a reasonable finish. I am presuming it is painted render.