Currently painting a freshly plastered room.
The three white walls were fine.
However, after a sealing coat, we tried a few samples on the other wall before choosing a colour.
Decision made, we painted over the samples with white - just the one coat, you could still see the sample colour underneath.
After this dried, we've applied two coats of the final colour, but you can still see where we tried the samples - shinier and lighter than the rest of the wall.
So what the hell do we do?
Keep applying coats until it's finally covered?
Give up and paint it all white?
Sample pots were Dulux - final colour is Crown, if it matters.
Thanks in advance.