How can I prevent color variants when painting over wall putty?

Question

I have used putty on the wall to fix the holes, and fill some gaps. the putty color is white while the rest of the wall is an older light green, I am painting a very dark yellow, However when painting the putty will give a darker color than the rest of the wall. how can I fix this?

Answer 1

You should use a primer/sealer on the entire wall, before painting.

Or select a paint and primer combination.

Or simply apply multiple coats of paint over the entire wall.