Hello,

I have a sloping (not straight) hole through a plaster/concrete wall that I was thinking of filling. The hole is about 3 cm in diameter and 26 cm long. I would appreciate some input on how I should proceed and what I should fill it with.
 
Skim it with regular expansion foam, once it has hardened cut away so it is about 1 cm deep and then apply plaster over.
 
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