[Woodco]

ya, i wonder if the OP was intended to reduce the orange peel or just concerned about bond. If texture is a thing, scuff and skim. If not, scuff and go.

The concern was for adhesion. Some people dont think paint will stick to semigloss. It also has to do with smooth vs. Textured walls. Painters that live in places where most walls are smooth, have a habit of pole sanding every wall, and thus might be a little reserved about painting a wall that hasnt been sanded. Its understandable... Those of us that live where everythings textured, never pole sand walls, so we paint over unscuffed semigloss all the time.

 

[RH]

I agree with Woodco that semi-gloss isn’t something to worry about with regards to the adhesion of another coat of paint. The only time I would wash things down (and all of these would be because of what is on the wall, not because of the paint) is in a particular dirty area like a mud room or one that might have a lot of lint/fuzz hiding everywhere like a utility room. I definitely wash down bathrooms due to the presence of chemicals (hairspray, soap residues, perfumes, etc) and most kitchens because of grease and other food related residues. Around and above the stove is a given.

I too like Krud Kutter‘s degreasing formula or the deglossing version depending on location. I almost never rinsed afterwards and never had an issue once, But yes, as CMN said, it only takes once