Narrow cracks can be filled with a masonry concrete crack filler that comes in a cartridge designed to be used in a caulking gun. Alternatively, you can create a concrete patch with a vinyl concrete patching compound applied and smoothed with a putty knife.
Appropriate repair materials include epoxies, urethanes, silicones, polyureas, and polymer mortars. For slabs, designers must choose a material with suitable flexibility and hardness or stiffness properties to accommodate both the anticipated floor traffic and future crack movements.
Wide cracks in concrete are best patched and sealed with a concrete patching compound. Smaller cracks, less than 1/4 inch wide, can be repaired with a concrete caulk or liquid filler. Patching compounds typically are mixed with water and applied with a trowel.
The fillers are generally used to fill gaps and holes in walls and wood (often decayed wood). Putty is used to smooth relatively small uneven surfaces caused by screw holes, scratches or coarse materials. The DIY tasks can be very specific.
Choose acrylic latex
Alex Plus is one good choice, but there are several others. If you are dealing with a large recurring crack in a wall corner or in a crown molding joint, choose a product with better flexibility such as a hybrid formula or Big Stretch acrylic caulk.
If you need to seal junctions between walls and seal cracks in ceilings or walls then it's better to use Caulk because it dries quicker and is much more resistant to weathering and high temperatures.
The most commonly used type of caulk for general-purpose projects around the home is acrylic latex caulk because it's well suited for sealing joints and gaps in wood trim. It's recommended to use this product in dry areas of the home, instead of in high-moisture locations, like the kitchen or bathroom.
Epoxy resins (EP) may be a solution for dry passive concrete crack repair. Polyurethane (PU/PUR/SPUR) may be useful for active cracks or to stop water ingress. Acrylate / acrylic to cure concrete leaks from cracks.
ArmorPoxy Crack Repair Putty is a 2 part (1:1 mix ratio) epoxy putty that you mix together to fill all types of cracks, including vertical surfaces. Goes on like 'Spackle', but five times stronger than concrete, and has 4 times the bonding power to concrete vs. mortar type crack repairs.
Description: Perma Crack fill is a specially formulated polymer modified repair mortar designed to fully meet the requirement of effectively filling cracks in plasters and in concrete, avoiding the use of costly sealants.
Silicone caulk is excellent at water sealing and flexibility so it has its place in construction. There are two main places it never should be installed, wood or any painted surface.
Sealing joints on a damp surface should be strongly avoided, since silicone sealants generally do not adhere as well to moist substrates. If you want durable joints, never apply sealant in rain, freezing rain, snow or heavy fog.
In general, sealant is the prefered sealing solution for bathtubs and showers, as it is more water resistant than traditional caulk. Silicone sealant forms a watertight seal that is resistant to heavy temperature changes.
Therefore crack filling is most effective in milder climates with less extreme temperature swings. Crack filling materials include liquid asphalt, asphalt emulsions and cutbacks. Crack sealing is a more costly procedure for the pavement owner but provides substantial value due to its long life expectancy.
Made from Gypsum, Plaster of Paris (POP) is a white powder that is used for giving fresh coats to the walls, giving shapes to structure, or creating casts, and likewise. When moistened, it hardens up quickly and is favored a lot by the construction team for quick finishing.
Polycell Crack Free Ceilings is a great way to restore cracked ceilings to a smooth 'good as new' finish. It's flexible paint formulation uses Polyfilla technology to not only cover cracks but prevent them from reappearing.
If you have to paint a wall presenting a crack, a solution would be to apply an elastic and over-paintable material inside the crack. Then, apply the paint. Since paints are very thin layers, the material will follow the movements of the crack and will not highlight the problem.