Just redecorated our living room. After we'd put all the furniture back, I noticed that there was a screw in the wall where we are no longer going to hang a picture, (due to new furniture etc).
I removed the screw, filled the hole, and rubbed down. This left a patch of wall about 40 mm square that needed repainting. I got out the paint I'd used to decorate and painted over the patch. The paint has a silk finish, but after it dried it left a matt border around the patch. I repainted, going out a little further, guess what ? Now I've got a 100 mm square patch, with a matt border.
What has gone wrong, I've done this many times before, and never been able to see the join, even a couple of years after the original paint job. The paint is just bog standard Dulux Silk Emulsion, at this rate I'm going to have to re-paint the whole wall again.
Any ideas how I can fix ?