We had the same problem throughout our home.
Select a test area where the shadowing is easily seen. Clean or dust the area as necessary. Apply a top coat in the color and sheen of your choice using a very high quality paint. My recommended paint is Sherwin Williams - Emerald, Duration or Super Paint. Satin provides a very nice sheen. Follow manufacturers instructions. If this works then paint the remaining walls.
If you use a modestly priced and quality brand paint I strongly recommend that you first apply a coat of KILZ PREMIUM White Water-Based Interior/Exterior Primer, Sealer and Stain-Blocker.
Use a brush to cut in the border lines. Use high quality rollers to paint the walls.
A sincere good luck!
It looks like there are areas with not enough paint or a dry roller lifted the paint. Prep is the key. Walls need to be primed. KILZ or BIN primer. Then paint. Roll the paint in a "W" on the wall in a small area. Go over that up and down to spread the paint. Go to a the next area. Keep a wet edge to blend the paint.
I agree with William, preparation is key. Primer is a must and be sure to use the correct type of roller and paintbrush for your paint. All good tips above.
There is considerable debate about this issue, I would try sanding the area, clean thoroughly, apply a primer like Kilnz and repaint with a quality roller appropriate for your paint. Good Luck.
If your sheetrock is uneven, that will cause that look as well, barring that, I would use a very high quality paint tha includes primer, also, a flat will show much less imperfection. Use a good roller, be consistent with the pressure you apply, also apply paint in a sort of w pattern with your roller, then fill in. Good luck
I believe that this is the root of the problem as I have applied 3 coats of paint and the result is zlways the same.thznks for the tip
not actually resolved as I will use her tip to see if it works...thanks
Place a straight edge horizontially against the wall. This quick test should reveal high areas. If high areas are found the drywall was improperly installed. Correction is possible but problematic since the wall has been painted. Unless you are skilled with drywall work you may want to consult a drywall contractor. Limited wavy areas can be set right DIY. Larger expanses not. Please continue to keep us updated so we can continue to help.
Run your finger over the wall. This simple test should detect a wavy surface. If you are familiar with drywall work the correction may be a DIY job. If not consult a professional drywall contractor. I can provide further advice but since three coats of paint have been applied I fear a DIY job may be fail. Please keep us updated. Oh, make sure water is not seeping into the top of the drywall.
I sand papered the area that needed to be done and applied a flat paint as suggested by one of the readers...