Renovation sofa imitation leather by cast

Hello,

I followed your recommendations to renovate a chocolate "By Cast" imitation leather sofa with a cleaning step and a step of applying a colourless protective coat with a roller. This sofa had no holes, but wear and tear on the surface with a sticky/sticky appearance when you sit in it in the most stressed areas.

The result: the surface sticks less when you sit down, but still sticks a little and the protective layer has left in places in the form of more or less large blisters. Photos are available.

Please indicate a procedure to me to achieve a better result.