Kilz paint and primer solutions claim to kill mold when applied over it.

Kilz does not kill mold. Kilz is a mold-resistant paint that can prevent the growth of mold but doesn’t kill it. Remove the mold from the wall then apply water-proof Kilz Paint to prevent the mold from growing back.

Find out the cause of mold growing on your walls and solve it before you can paint or apply anything on your walls. It is the only way you can kill and prevent mold from growing on your walls.

Does Kilz Paint Kill Mold

Mold grows on walls due to excess moisture. Mold is a fungus. It grows on wet walls since there is a conducive condition for its growth.

When mold grows on your walls, it leaves unsightly black marks. They make your walls look ugly.

Does Painting Over Mold Kill It

Many people think that painting over the mold with paint or primer kills the mold. However, this is not true. Applying paint over mold only serves to hide the mold and the mold spots as the mold continues to grow.

If you want to kill mold and prevent it from ever growing on your walls, solve the moisture or humidity problem first. First, find out what the cause of wetness on your walls is.

Do you have a leaking tap?

Is there a pool of stagnant water near your house that needs draining?

Contact a professional to help eliminate the moisture problem. A professional will help remove the source of wetness and humidity in and around your house.

Why You Should Not Let Mold Grow On Your Walls

First, mold makes your walls ugly. When mold grows on walls it leaves ugly black and green marks. They can spread over a large area of your wall making it unappealing.

Secondly, when mold grows on your walls it can cause respiratory problems and diseases to those living in the house.

Third, it will cost you money to solve the problem. You have to call a professional to repair leaking taps or drain stagnant water. If you don’t call a professional, you will buy new taps or drain stagnant water by yourself.

It will also cause you to spend money when you go to the hospital to have your respiratory conditions solved.

Why You Should Not Let Mold Grow On Your Walls

How Do Mold-Resistant Primers And Paint Work

Mold-resistant primer and paintwork by preventing the growth of mold on walls. For it to work effectively, you need to solve the moisture problem first.

Once you have solved the moisture problem and removed all the mold on your walls you can now apply the mold-resistant primers and paint.

These primers and paint prevent the wall from absorbing moisture thus preventing the growth of mold on the walls.

Can You Spray Kilz Over Mold

It is possible, but it shouldn’t be done.

Spraying Kilz over mold is a short-term solution. You only hide the mold without solving the problem that caused it. Painting or spraying primer over mold doesn’t stop it from growing.

Mold and mildew will continue to grow unseen under the Kilz paint or primer. Therefore, painting over mold is not the solution.

Before you spray Kilz on a moldy wall, remove the mold from the wall. Also, find out the cause of the mold and solve it.

After you have finished these two steps, you can now paint Kilz on your wall. As an anti-mold paint, it will prevent mold reoccurrence on your walls. Protecting both the property and its occupants from structural and health problems.

How Do You Remove Mold From Walls

You can choose a home remedy to remove mold from the walls. Mix bleach and water. Spray this mixture onto the wall as you scrub. Make sure to wear protective clothing. It prevents you from breathing in the mold and causing you respiratory problems.

If you have mold growing deep into the wall, you will need vinegar instead of bleach. Vinegar penetrates the wall to kill and remove the mold from deeper into the wall. Do not mix the bleach with vinegar when cleaning mold off the walls as it produces toxic gases.

Besides a home remedy, you can buy pesticides to wash the mold off the wall.

Additionally, you can hire a professional to remove mold from the walls of your property.

Can You Spray Kilz Over Mold

What Are The Symptoms Of Mold Exposure

Mold growing on your walls can make you sick. Often, you get the symptoms of mold sickness when in a house with mold.

When you are outside the house, you are completely fine. When you get into the house and you breathe in the moldy air, allergic reactions occur.

Symptoms of mold exposure include headaches, inability to breathe, consistent coughing, runny nose, sneezing, fatigue, and watery eyes.

Depending on your body and how you react to mold exposure, these symptoms can start as soon as you breathe in the mold particles. Or, it could take some time and then start later.

Additionally, the symptoms may also end as soon as you get fresh air in your system. Or, they may persist for a while before they clear on their own.

If you are asthmatic, mold exposure can trigger asthmatic attacks.


Many bathroom ceilings are susceptible to mold growth due to the humidity in the bathroom. You can solve this mold problem on your bathroom ceiling by washing the mold-infested part of the ceiling with warm water and mild soap or detergent. Use a soft cloth for washing and let it dry.

Now, make a bleach solution. Mix a quarter cup of water with a quarter cup of bleach. Apply this solution to the affected area of the bathroom ceiling. Wait for 20 minutes then apply it again and wait for it to dry.

Bleach kills all types of mold. It is an easy, affordable, and quick solution to mold in your bathroom.

When you have finished the bleach treatment and the mold is gone, you can apply a Kilz primer on the ceiling. It is water-resistant and will prevent moisture from sticking to the ceiling. Mold requires moisture to grow. Without moisture, mold will not grow on your bathroom ceiling.

Yes, you should.

For the best results, it is best to wash your walls before painting them. Washing walls removes dirt and dust from them. You don’t want to paint over these.

Washing your walls before you paint them also allows you to check on their status. You can check for mold and cracks which should be repaired before you paint the walls.

Before you paint, make sure that your wall is dry then apply Kilz.

If you have mold already growing on your walls, you can easily remove it with a cheap bleach and water solution. You don’t need to hire a contractor for this.

Also, check on the source of humidity on the walls that allow for mold to grow. If you need to change leaky taps or apply Kilz primer and paint on your walls you don’t need a contractor.

However, if the source of moisture that causes mold growth on your walls is too large and has to be drained you need to hire a contractor.

You can also hire a contractor based on the spread of the mold in the house. If you have more than two rooms with mold growth, hire a contractor to remove and prevent mold from growing in your house again.

You can use the tool to hire a contractor.

At the top of the tool, enter your zip code. Then fill the form to provide information on the service you would like to receive.

Your information is then sent to three contractors. You will receive quotations with no obligation to hire the contractors.

You can choose from the three contractors and hire one for the service you need. Hire the best contractor for your budget and mold removal.

This tool makes it easy to look up contractors and to hire one for any task around your home.

There are several homemade solutions you can use to remove bleach, The most common is bleach and vinegar.

Bleach mixed with water is used to kill mold on the surface of walls. Dip a cloth into the mixture and wipe the mold off the wall. If the mold is too deep into the wall, spray a vinegar solution.

Another homemade solution you can use to kill mold is a baking soda solution. Mix baking soda and water into a paste. Apply the paste on the mold and wipe it off with a soft cloth.

Finally, spray a more liquid mixture of the baking soda solution onto the clean surface and leave it to dry.

You can also use a grapefruit seed extract to kill and wipe off mold from your walls.

Benjamin McInerny
Author: Benjamin McInerny - is a qualified arborist with 20 years of industry experience. Ben has a wide knowledge of renovation and DIY projects around the house such as lawns, fencing and painting. Ben shares his skills with DIY and gardening enthusiasts.