outside render repairs

[zante1409]

Hi I have some areas of blown cracked render on the ouside wall.what ratio of sand and cememt do I use....

Also i Have some concret moulding and window ledges which have damage and would like to know what to use to mend /rebuild these I do not want to use an epoxy based product as the wall is unpainted render..please help if you have any pointers thanks

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[Micilin]

Pictures are good,

Depending on how much building out is needed, a Silver sand/lime/OPC/SBR mix is good.

A 3:1:1:2 mix is good onto clean, primed (with SBR/OPC 1:1 ) surface but depends on depth and finish required.

Edit - for mouldings, ledges etc