Don’t Apply Kilz Primer on Floors (Here’s Why)

You can use any paint and primer on your floor, except Kilz primer. Why?

You shouldn’t use Kilz primer on your floor. That’s because Kilz primer doesn’t have a glossy finish and doesn’t protect your floor from high foot traffic and heavy use.

However, you can use Kilz on strong and durable floors, such as concrete or tiles. That’s because these floors don’t need much protection from the Kilz.

What is Kilz Primer?

Kilz is an oil-based thick paint primer. You can use Kilz primer to seal stains and imperfections and to prevent bleed-through on porous surfaces.

Kilz primer is designed with a flat (and no sheen), meaning that Kilz has a dry textured finish. This is the main reason Kilz isn’t recommended for flooring. The textured finish of Kilz isn’t strong enough to withstand heavy usage and high foot traffic. 

If Kilz is Applied Over Floors:

If applied over a floor, Kilz will adhere properly to it. That’s because Kilz is designed with impressive adhesive qualities. However, the Kilz primer won’t protect the floor because Kilz is a primer and not a floor finish. 

So, Kilz is used on a floor as a base coat and not as a final coat. This means you must apply paint and a sealer over the Kilz primer to protect the floor. Leaving only the Kilz primer on a floor isn’t enough to protect the floor. 

Also, the dry textured finish of the Kilz attracts dust and debris. So, you must properly clean the Kilz primer before applying new paint over it. If you don’t, the dust will prevent the new paint from sticking. This leads to a sticky floor finish. 

Types Of Flooring That You Can Use Kilz On

You can apply Kilz primer on floors that are strong and durable. These floors can handle high foot traffic without a primer or sealer.

  1. Concrete Floors

Concrete floors are strong and tough. The floor is made from a combination of concrete, sand, and other durable materials. As such, concrete floors by design can’t be damaged easily. So, you can use Kilz on concrete floors.

However, Kilz won’t dry to form a glossy layer on the concrete. Instead, the Kilz coating will become textured, so it can be easily stained. So you will need frequent cleaning.

  1. Tiled Floors

You can also use Kilz on tiled floors. This is because tiled floors are strong and moisture-resistant. So the floor is tough enough to handle the high foot traffic and usage associated with indoor floors.

However, Kilz coating won’t last long on a tiled floor. That’s because the Kilz isn’t a floor finish and can’t withstand the constant foot traffic. Also, Kilz won’t adhere well to a tiled floor because tiles are slick and non-porous. 

  1. Subfloors

Kilz primer is designed to be used on a subfloor. The subfloor is the foundation of your floor. You can apply Kilz on the subfloor before you lay laminate or hardwood over it. The Kilz primer will prevent water from penetrating the floor from underneath. 

  1. Composite Floors and Decks

You can also use Kilz primer on composite decks.

Types Of Flooring You Can’t Use Kilz On

You shouldn’t use KIlz primer on weak and non-durable floors. These floors aren’t strong enough to withstand heavy use without a sealer. So, you must apply a glossy finish on these floors, not a Kilz primer coating.

Here is a list of floors you shouldn’t use Kilz on:

  1. Wooden Floors

You shouldn’t use Kilz primer as the final coat on wooden floors. That’s because Kilz doesn’t protect the wooden surface from moisture and dents, which can cause the wood to rot. Also, Kilz primer will prevent wood finishes from penetrating the floor surface and sticking.

  1. Outdoor Floors and Decks

You shouldn’t use Kilz primer for outdoor floors, such as decks. This is because outdoor floors are exposed to weather elements and moisture, and Kilz primer won’t protect the floors from weather elements. Instead, you must apply a waterproof sealer over outdoor decks, not Kilz primer.

  1. Finished Floors

If the floor is already painted, you shouldn’t apply Kilz primer unless you want a new finish. A Kilz primer over a painted surface will do more bad than good. However, if you want to apply over a finished floor, you must apply Kilz primer to allow the new paint to stick.

Kilz Dry Time Before Floor Finish

Kilz must dry for one hour before applying a floor finish or paint over it. That’s because kilz primer is oil-based and has a thick flow, so you must allow 1 hour for the solvent (oil) to dry. 

The finish might turn sticky if you re-coat the Kilz primer too soon. That’s because the floor finish (or paint) won’t stick to a tacky or wet primer; this ruins the finish.

To know if the Kilz primer is dry enough for a re-coat, try sanding it with fine-grit sandpaper. If the sandpaper moves over the Kilz primer easily, it has dried enough, and you can re-coat it. But, if the sandpaper gets clogged on the Kilz coating, the primer is still wet and not dry enough for a re-coat. 

Things To Know

Kilz Doesn’t Protect The Floor

Kilz primer doesn’t protect the floor from moisture or dents. This is because Kilz is designed to seal surfaces and not protect floors. As a result, Kilz doesn’t have a strong top coat to protect floors.

Kilz Isn’t Waterproof

Kilz primer isn’t waterproof; at best Kilz primer is water-resistant. So, the primer must be used to prevent bleed-through and to provide a smooth surface for the new paint to stick to, but not for its water-resistant qualities.

However, Kilz has different types of primers and paints; some are waterproof.

Don’t Leave Kilz Unpainted

You shouldn’t leave Kilz unpainted. That’s because Kilz isn’t formulated with additives to make the primer thrive under heavy use or exposure to water. So, if left unpainted, Kilz primer will get washed off. 

Final Words

You shouldn’t use Kilz primer as a top (final) coat for floors because Kilz primer isn’t strong enough to protect the floor. Also, Kilz primer prevents wood oils from penetrating the wood floor surface. This prevents the floor from getting an amber-like finish.

However, you can use Kilz primer on subfloors or durable floors such as concrete. This is because these floors are durable and don’t need protection. Also, subfloors don’t need an oily finish as wood floors do.

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