Rendering Repairs - ordinary cement or quick-drying?

[MickBee]

I need to patch-repair some blown rendering on a garage, and assume that the best mix would be 5-6 parts Plastering Sand to 1 part Cement and 1 part waterproof PVA (unless anyone suggests a better mix?)

Given that the weather in the next few days should be quite warm, which cement would be better to use - ordinary (Mastercrete) or an extra-rapid cement?

Quantities involved are relatively small (based on an Artex repair kit of 5kg covering a 400 mm radius circle, which I make about 0.12 m2, I should need about five times that quantity, so 1 X 25 kg bag of sand and 4kg to 5kg each of PVA and cement.)

This means that cement cost is not a big factor (under £2 difference for 10kg) when compared with getting the job done well, and done easily.

Complications of the job are access and plants - there are plants growing up on trellis by the wall, which will have to be held back.

Any (relevant) hints & tips would be welcome.

 

[pred]

Remove any loose render, give the area you are going to patch a coat of PVA/water 1/5 on the first coat then 1/3 on the next coat, do not use B&Q PVA for this as it has already been watered down to about 1/100 completely useless and waste of time and money, there are a number of good makes such as Cementone and SBR.

You are now ready to mix the sand/cement 4/1 and I recommend Sovereign waterproofer, it also acts as a plasticiser, an MT tin full to a builders bucket of water, something like 1/30, go for two coats, a scratch coat then another to finish it off, in this heat it is easy to do both in a day but not crucial.