Silicon render over newly painted sand and cement render

[Lombear]

I refurbished my property in the past 2 years and my builders rendered the rear of the property with sand and cement. I have painted it with Sandtex. The side and front of the property hasn’t been done yet as I need to finish off other parts of the property prior to rendering. I have decided to use silicon render on the front and side and in hindsight wish I had used it on the rear of the property. My question is can the rear of the property have silicon render applied over the top?
Thanks

 

[Alastairreid]

It would have to be meshed as you have painted it.

 

[Lombear]

It would have to be meshed as you have painted it.

Thanks. The existing render is stable so at least I don’t have to take it all off.