Will render stick to painted block work?

[RichTraff]

i have a part built single skin blockwork shed at the end of the garden. It's an eye saw. I was planning on having it rendered but don't have the funds at the minute.

Is it a bad idea to paint it until I can get it rendered in a couple of years?

 

[stevethespreader]

Yes if you paint it it will have to have extra prep to make the render stick