Either skim coat the entire wall with drywall compound, or have a plasterer come in and skim coat a thin layer of plaster. The drywall compound you could do yourself. It is messy, but not brain surgery. A plasterer will put a bonding agent over the paint and then put a thin coat of plaster over the entire wall.
Lightly sand the troublesome area with 150-grit sandpaper, then tack the walls. That's painter lingo for ``Wipe it with a cloth to get rid of dust.'' (Easier than the lingo makes it sound!) Then re-paint the area, maintaining a wet edge--meaning, don't let the paint dry until you finish the wall.
There are several ways to damp proof a wall. One is to install a damp proof course, which is a layer of material that helps to prevent moisture from penetrating the wall. Other methods include painting the wall with a waterproof paint or sealant, or covering the wall with a waterproof membrane.
Glossy and satin sheens are more likely to show imperfections, but some matte sheens can be challenging to clean despite being better at hiding blemishes. Choosing a more middle-ground sheen, like eggshell, could be the best solution when your goal is to hide imperfections.
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.
Wall condition: If your walls are in good condition, you may only need one or two coats of paint to achieve a smooth, even finish. However, if your walls are rough or damaged, you may need to apply additional coats to cover up imperfections.
But the cheapest way to deal with groundwater wall dampness is to cover it up with PVC wall panelling. This is a go-to option when you are looking for quick, cheap and permanent solutions.
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.
Using damp proof membranes are a great way to damp proof walls as they are easy to install and also extremely flexible.
Now, the question arises: Can you really slather on a fresh layer of drywall mud over those colorfully painted walls? The answer, my friends, is a resounding yes—with a few caveats. It's all about the preparation, the type of paint, and the techniques used.
When it comes to covering bad walls, paintable textured wallpaper is a great solution. This wallpaper features a textured (raised) design, which makes it highly effective at covering uneven surfaces and imperfections in your walls.
Using Flat Finish Paint:
This also reduces the visibility of dents and dings and other drywall imperfections. Flat finishes also look bolder and classier than other glossier paints.
Waterproofing Paint: Applying a waterproofing paint or sealant is one of the most affordable solutions. These products are designed to prevent minor seepage and are readily available at hardware stores. Ensure the wall is clean and dry before application.
Most standard buildings and contents home insurance policies do not cover damage caused by damp and condensation.
Wall paints are the best solution if there are any little flaws over the surface of the wall. If there are flaws like spill marks or dust marks which are tough to remove, then painting can be the best way to cover them up.
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.
Dilute the paint by 5 to 10 percent with water for latex-based paint or mineral spirits for oil-based paint. Stored paints can lose moisture, making it more difficult for touch-ups to match the original coat.