Can i paint over this semi sanded gloss door?

Question

The door has been painted with white oil-based wood gloss paint over the past 15-20 years (See first image). In the past, I would just paint over it which worked fine the few times I did it.

Now I want to switch from gloss to satinwood paint, I've brought Dulux trade satinwood white. From my research, I understand it's not possible to just paint on top of the current gloss paint so I started to sand down the door. See before and after image:

• Do I need to sand the door down 100% where the is no paint left?
• Can I just sand down the first layer so the gloss paint is semi removed and then paint over it?

Answer 1

Can I just sand down the first layer so the gloss paint is semi removed and then paint over it?

YES - there is no need to sand all the way through the existing paint. You just need to de-gloss the paint and the new paint should stick fine.

Concern- the fact that you repainted previously, without sanding, may cause one or more layers of old paint to start to peel up. This is a problem that would require more thorough sanding. In fact, you would need to sand off all paint that appears to be peeling.