wall patches have noticeably different texture from rest of wall
I live in an old house with plaster walls. We recently moved in an POs did lots of patching, from little holes to long cracks. In each of these, I can tell a dramatic difference in the paint texture of the wall compared to the patch. The wall has the complex, slightly bumpy texture that most rollers cause while the (mostly small) patches are TOTALLY smooth in terms of paint texture.
Why is this? I would like to do more wall repairs but I am hesitant to do so if I will create a large, unnaturally smooth-looking area. The contrast is striking.
I should add that existing patches look like one layer of compound followed by minimal sanding.