In reply to my own question above the answer is prime with SBR and use a cement based mortar. (as informed by friend/ex builder)
Pics of the offending holes, Crittall windows are fine under all the layers of paint though, don’t think you could say the same for UPVC after 70 years ..
In reply to my own question above the answer is prime with SBR and use a cement based mortar. (as informed by friend/ex builder)
Pics of the offending holes, Crittall windows are fine under all the layers of paint though, don’t think you could say the same for UPVC after 70 years ..
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