How to Apply Putty On Walls

How to Apply Putty On Walls: All You Need to Know

There are different products that we can use to patch cracks and holes on the walls. Putty is useful when patching cracks and holes on plastered or concrete walls. It will make the walls even that you may not realize the was a crack before. You need to mix putty well and apply in thin coats, allowing it to dry before proceeding. How to apply putty on walls is pretty the same on different kinds of walls, but expect excellent results on plastered and concrete walls. Properly mixing putty is as important as prepping the walls to apply. 

Here are steps to follow when applying putty on walls: 

Protect yourself

Make sure to have gloves, eye protection, and a breathing mask on before mixing putty. While prepping the walls, dust particles might irritate you. Putting on eye protection and a breathable mask will prevent eyes and lung irritation. Additionally, the mixed putty may irritate your skin, so gloves are desirable. 

Cover elements to protect

Use tape to mask items you don’t want putty on them, for example, door trims or window trims. For the finished floors, use a drop cloth or plastic sheet to prevent putty droppings on the finished floor. Taking your time to cover things up is better than having to remove them later. 

Scrape and sand off

If you are working on a new wall, this step is not necessary, but if you are working on an old wall with paint, you will need to scrape and sand to remove flakes, chips, and bumps off the walls before applying a new layer of putty to even up cracks and holes. While working on holes and cracks less than half an inch deep or wide, use a screwdriver plate to eliminate loose material. If holes and cracks are deeper or wider than 0.5 inches, repair them using other methods, not a putty application. 

Use a dry brush to remove chips and flakes

Brush the entire wall using a dry brush with a sturdy whisk to remove chips and flakes. While doing this, protect yourself using eye protection because dust might irritate your eyes. 

Use a sponge to wipe and moisten the wall

Dip a soft sponge in clean water and wring it a little bit to let water; use it to wipe over your selected area of putty application. You can apply the putty even when the wall is still dumped; it will help the putty adhere well to the wall. If you can’t find a sponge, use a piece of a rack. 

Putty and paint

Start mixing the putty with water in a bucket using the ratio of 2:1, but refer to putty packaging for mixing instructions. Pour the water first into the bucket and the right ratio of dry putty and mix. Create a mixture that you know you can use within two hours because it will be hard to work on after two hours. If you are not sure what amount of putty mix you can use within two hours, make a less mixture and make another batch when finished. Help keep putty moist by covering with a damp towel over the mixture while working. Dry-mix putty is recommended for outdoor applications, while the pre-mixed putty is suitable for indoor applications. 

Make sure putty is thoroughly mixed with water; you can use a power mixer or manually using a stirring stick. In any case, there should be no lumps remaining. It should thick and consistent without seemingly drying. In any case, if the putty seems to be dry, add water accordingly or add dry mix if it seems too dry. 

Apply putty and paint

Scoop putty and fill the holes and cracks using a putty knife, then scrape over with the blade to remove excess putty. Do this vertically and horizontally to make sure the walls are even. Allow the putty to dry. Do the sanding and apply primer paint after that. Use an appropriate primer for the right job; for example, if you are working on exterior walls, use a primer made for application outdoors. If you are working indoors, use primer paint designed for use indoors. After applying the primer to the putty application areas, you may want to apply it to the entire wall. 

You are now familiar with how to apply putty on walls; after making these repairs to the walls, add a primer to even up the patched areas with the rest of the wall. You can also apply the coating to ensure the patched areas blend in well with the rest of the wall. 

Putty takes up to 16-24 hours to dry completely, so it is best to leave for one day before applying the next coat. To check whether the putty has dried or not, press gently with the finger while darker areas indicate moisture is still there. 

Wall putty types

There are two wall putty types available; acrylic and powder. We use putty for general wall care, i.e., for finer finishing or primer to colors. It can also function as a filler or sealant. Acrylic type is best for indoor projects, while powder type can work outdoors. 


When applying putty to the cracks and holes in the walls, it is advisable to wear eye protection, gloves, and a breathable mask to avoid irritation. Before you start, cover elements to protect or use a drop cloth on the finished floors. Remove chips and flakes before applying a new layer of putty. For cracks and holes deeper than 0.5 inches, use other methods other than putty. Mix water and putty in the ratio of 2:1 for high performance or rather check the packaging instructions for specific usage. There are two types of putty you can use for your home renovations and repairs. Acrylic type is best for use indoors, while powder type can work perfectly outdoors. When buying putty, choose the appropriate type. 

Now you know how to apply putty on walls, either to repair holes and cracks or if you want to use putty as a primer. 

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