Sanding is probably the easiest way to do it. You could skim coat the walls but that'll take forever and isn't exactly easy. You could also use spackle or joint compound to skim over the imperfections then sand to blend it into the walls. They won't be perfectly flat but the imperfections won't be as noticeable.
plasterboard is the quickest, cheapest and easiest solution, lightens up the room immediately, paint and your done, a new modern room in no time.
Use a paint scraper to remove excess plaster around fittings and borders. Allow the first layer to dry and sand to remove any texture before repeating the same steps for the second layer. Once completely dry, sand the wall down with fine grit paper and you will have smooth walls, ready to be painted or papered.
Textured paint: For a more dramatic effect, textured paints mask uneven walls with a decorative finish. High-quality primer: A good primer fills gaps and creates a smooth surface for paint adherence. Thick paint: Thicker formulas smooth surfaces and cover uneven areas.
Traditionally, an uneven wall can be corrected by either plastering the wall or, if the wall is particularly irregular, installing plaster boards. Both of these methods will require the skills of an expert, especially if you want a guaranteed professional finish. An alternative method is to install PVC wall panels.
Smooth Finish: No one wants bumpy, patchy walls. PVA drywall primer smooths out inconsistencies in texture, making the final result look silky smooth.
Skim coating a room yourself costs you about $50 in materials and $430 in tools if you don't have them already. Hiring a local drywall contractor is usually $50 to $100 per hour, and the average room takes four to six hours to complete—totaling a labor cost of about $200 to $600.
Several paint colors and finishes excel at concealing minor wall imperfections, drywall seams, and surface irregularities. Darker shades like deep greens, rich blues, and warm browns naturally absorb light rather than reflect it, making bumps and uneven textures less visible.
Polycell Polyfilla SmoothOver for Damaged and Textured Walls. Gives a smooth surface that's ready to paint…. This product is not for online sale and can only be purchased from selected stores. Coverage 2.5 litres will cover up to 5m²(average layer thickness 0.5mm).
Skim coating can be a great way to smooth out or prepare worn or damaged walls for a touchup and is a relatively easy task that even novice drywall workers can add to their arsenal.
To hide imperfections, such as cracks and dents, the Zinsser Bulls Eye 1-2-3 Plus Interior/Exterior Water-Based Primer works well. To promote adhesion and durability on surfaces, such as metal or tile, the Rust-Oleum Zinsser Bulls Eye 1-2-3 Plus Primer is an excellent choice.
Know how to smooth walls before painting, especially holes left from nails and picture hangers, as well as any dings and dents. You can take care of them easily with DAP Fast Dry Premium Spackling and DAP Alex Plus Spackling.
Thicker wallpaper will conceal imperfections much better than thinner paper. Pattern and color matter. It's better to choose a dark color or a busier print. Textured wallpaper will work best for bumpy or rough surfaces.
If your plaster is in relatively good condition, and it is just a few bumps and hairline cracks which are causing issues, sanding first is a good option to try. It will work with minor imperfections and give your entire wall a good smooth surface ready for painting.
Most likely they settled unevenly or the foundation shifted over the years - highly unlikely that they were built crooked. But, possible that not all the angles were perfectly straight to begin with, as that is still the case in many building built today.
Paint designed for uneven surfaces may be sold under a range of names including elastomeric paint, high-build paint, crack-free paint or renovation paint (which is basically a filler and undercoat in one). These paints are much thicker than ordinary paints which gives them much better coverage.
Various objects, such as wall art, frames, and vases can be used to hide the damages in the wall. Another great way would be to add an organic and natural touch to not only your wall but your house through plants. Plants can not only add a touch of greenery to your house but can also clean the air, making it fresh.