How to touch up wall paint with roller.
A roller applies a lot of paint and this new thick layer is the problem.
Diluting paint adds moisture, which slows the wicking rate and increases the time needed for the paint to set up.
Make sure to also use the same paint finish for the touch up.
Perfect for small projects and quick touch ups.
My guess is the paint was applied by a roller or sprayer, and the touch up was done with a brush.
If the paint damage includes a gouge in the drywall or other damage, use a spackling compound to fill in the holes.
Then open the can and stir the paint.
This will apply the correct amount of paint to the area where the stain or patch is, and apply less paint as your roller reaches the outer edges.
If you don't have enough paint on your roller, it can leave behind patchy areas.
Reproducing the exact wicking rates each time you paint is virtually impossible, but you can try to influence it.
If the paint on the walls (or ceiling) is not faded or dirty, and if you have an exact paint match, you can probably touch it up.
How you apply the paint can also have an impact.
If using a roller, sweep out from the center of the area with a clean, dry roller, slowly lifting away from the wall as you go.
Of paint, enough to cover around 10 square feet.
This is a usually a problem with with the sheen differing due to different application techniques.
Be patient and wait until the paint has dried completely before evaluating.
Using your leftover paint, shake the can before opening.
You can slow down the amount of water lost through wicking by diluting the paint when using it for touchups.
That is mixing spraying, brushing, and/or rolling.
Use the smallest brush or sponge applicator for the job.