Wall paint peeling easily, even with surface prep

[teeeeee]

Hello, I have recently painted an internal hallway (yellow), and now come to paint the white shelf so applied painter's tape to the yellow wall (Frogtape precision) . After gently removing the tape, the yellow paint easily peeled off with it (see picture).

- The yellow paint is Valspar Classic Walls and Ceilings (water-based, matt).
- The wall originally had 2 coats of white emulsion on about 2 years ago, on top of the fresh plaster.
- Then this week I have sanded the wall back smooth with 180 grit, and then dusted and wiped it as clean as possible.
- Finally, applied two coats of yellow Valspar, 1 day apart. Then 1 more day later, applied the frogtape. After 10 mintues, removed the Frogtape and saw the peeling.

Have I done something wrong in my prep here? I was under the impression that no primer would be needed, because this wall was previously painted white emulsion. (You can see that the white paint below is not peeling, only the yellow coats). Is there anything that I can do to avoid this?

 

[opps]

I do not see anything wrong with your prep.

Initially I wondered if perhaps someone might have previously used a silicone spray polish on the ledge, but you would have seen "fisheyes" in the yellow emulsion.

I would contact the retailer/manufacturer. I suspect that they may tell you that water based paints take up to 7 days to fully cure.