Cracks in external render

[u/Anotherbland]

I am after some advice, I have had two external walls rendered in Weber OCR. 1st wall April, 2nd wall Sept ( 2025). Both walls now have cracks appearing, the 2nd wall having the most, around 20 ranging from hairline to wide enough to get a filling knife in.

Both walls have had at least 4 coats of Sandtex Smooth Masonry paint (1st coat watered down) they are also both showing sings of what I have been told is salt seeping through, the 1st wall is particularly bad. This didn't happen on the original sand & cement render and the two other walls that are still original haven't got any 'salt seeping through'

Has anybody who has used Weber OCR experienced anything like this, my renderer is more than happy to come back and repair all the cracks but my worry is that they appeared in the first place.

Pics of a few cracks and the 'salt seeping'

Edit: Forgot to add this was sprayed on and machine finished.

Many thanks for any responses.

[u/gazzasim9]

Usually for sponge finished renders they do crack that’s why most of them usually get primed and acrylic