Painting concrete is slightly different from the standard paint job and requires a rigorous preparation process that can’t be skipped.
Not only will proper preparation help to ensure the successful completion of the paint job, but it will also be able to enhance the overall appearance and durability of the painted concrete, too.
Prior to painting, you’ll first need to clean the concrete and strip it of old paint.
After you have completed these two steps, it’s absolutely vital that you then proceed to seal the concrete, as this will help to prevent moisture from seeping into the porous surface of concrete, which can cause the paint to peel, as well as mold to form.
For the best results, we recommend using a masonry sealer, as this type of sealer will also help to prevent any cracks from forming on the surface of both the paint and concrete.
What should I use to clean concrete before painting?
One of the most important preparatory steps prior to painting a surface such as concrete is to make sure that it has been properly cleaned.
Concrete is an extremely porous material, so it naturally tends to harbor a lot more dirt and debris than other types of surfaces.
By making sure to clean all of this away prior to painting, the paint will have a smooth surface to adhere to, which will prevent the chances of early deterioration and peeling.
To clean your concrete before painting, the first thing that you should do is to make sure that you have swept away any surface debris (such as leaves and little rocks) with a broom, as this will help to smooth the surface you are planning to paint.
After doing this, you will then need to tackle the dirt and debris present in the deeper layers of the concrete, as remember, concrete is a very porous material.
To help rid the concrete of dirt, debris, and oil as much as you can, we recommend using some trisodium phosphate.
Ensuring that you have on protective clothing and gloves, carefully pour this chemical solvent directly over the surface and allow it to saturate for a few moments.
Then, take a power washer over the entirety of the concrete, which will blast out all of the remaining dirt and debris.
Does concrete absorb paint?
Yes, concrete does absorb paint. The main reason for this comes down to the composition of concrete, which contains lots of tiny holes.
This porous nature of concrete means that all types of liquid, including moisture and paint, can be absorbed through the little pores, which is the main reason why it’s so important to seal concrete prior to painting.
If you do not properly seal your concrete prior to painting, the paint will seep into the concrete and potentially cause the concrete to crack, spall, and even “pop out”, which is when an area of the concrete breaks out of the surface due to high rates of liquid and moisture within the concrete.
Does painting concrete seal it?
If you use paint in place of a masonry sealer, a variety of problems can occur.
As concrete is such a porous material, it means that liquids such as paint and water are able to move easily through the layers of concrete, and wreak havoc in the process!
If too much liquid or moisture is able to get into the concrete, then it can cause the concrete to begin to crack and break, and eventually require you to go down the costly route of replacing the slabs.
To prevent this from occurring, it’s very important to use a high-quality masonry sealer that will be able to seal the interior of the concrete and, in turn, prevent any liquids from seeping in and causing mold to grow and cracks to appear on the surface of the concrete.
For the best results, we recommend applying at least two coats of masonry sealer and being sure to follow the specific instructions given by the manufacturer.
How do I bond concrete paint?
Besides cleaning and sealing, another extremely important part of preparing concrete for paint is to ensure that you have used a high-quality primer.
A painting primer acts as the foundation layer of paint and helps to not only protect and smooth the surface of any imperfections but also to increase the adhesion of the paint to prevent any peeling, bubbling, or cracking.
When it comes to priming the porous surface of concrete, the best types of paint primers are acrylic and epoxy primers.
Both of these types of primers are able to bond to the surface of the concrete without causing any damage to the interior, and each offers a thin finish that won’t look cakey.
If you are painting an exterior concrete surface (such as a driveway) then we recommend using an epoxy primer as it is extremely durable and able to withstand exposure to the elements.
In contrast, if you are painting an interior concrete surface (such as a basement) we recommend using an acrylic primer to bond the paint, as it is most suitable for interior applications.
Should I PVA garage floor before painting?
Prior to painting your garage floor, it’s important that you make sure to seal it, especially if it’s concrete.
Though a masonry sealer is often deemed to be the standard go-to for priming floors, if you want a more cost-effective alternative, then PVA will work just as well, and more than likely save you some money, too!
In a nutshell, PVA is a type of glue that is commonly used for all types of DIY projects, which is why it’s gained the nickname of “builders glue”.
To apply the PVA glue to your garage floor prior to painting, you should ensure that you have properly cleaned the floor so that it does not contain any dirt or debris.
After doing that, you can then go ahead and grab a brush and apply the solution evenly across the floor, giving it around 8-10 hours to dry before applying your primer and paint.