Best Epoxy Primer – Guide for Priming Surfaces Properly

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If you are renewing a floor covering and would like to use epoxy resin for this purpose, an epoxy resin primer is also recommended. This offers several advantages. In the following, we would like to show you why an epoxy resin primer on concrete is worthwhile and how it is applied.



What is an Epoxy Primer?

Floors wear out over time, and become cracked or stained. Other signs of age and fatigue also occur. For example, they can turn yellow when exposed to intensive sunlight. Then it is time to repair the floor. This can be done by applying a new coat of paint.

Epoxy primer helps to protect against moisture because it forms a strong, durable and seamless barrier on the surface it is applied to. The epoxy resin used in the primer reacts chemically with the surface to create a bond that is resistant to water and other environmental factors. The barrier created by the epoxy primer helps to prevent water and moisture from penetrating into the substrate, which can cause rust, corrosion, and other forms of degradation.

Before doing so, however, you should prime the floor. In the long run, this will not only save you money, but also your nerves, because priming protects the floor from a variety of influences:

  • On porous surfaces, a primer can have the same effect as a base color for wood. The paint stays where it should be and is not absorbed into the substrate over time. Therefore you do not have to apply several coats of paint. It is sufficient to apply a solid primer in two layers, followed by the actual application of paint. This procedure is particularly appropriate for concrete.
  • Paint does not adhere particularly well to smooth surfaces. Therefore, you should first apply a primer to these as well. Otherwise, there is a risk of insufficient adhesion of the floor paint, so it becomes rough over time and splinters off. You will then have to repaint the floor. The primer, however, ensures a long-lasting adhesion of the paint. It is therefore a kind of medium between the substrate and the paint coat.

A good primer therefore ensures that paint adheres better, the substrate becomes less absorbent and the floor coating has a longer life. An epoxy resin primer can also serve as a rust protection.

epoxy primer



Which Substrates can be Sealed with an Epoxy Resin Primer?

Various types of epoxy resin primers are available in the trade. Some of them are particularly suitable for mineral substrates such as concrete and screed, while other products can also be used for tiles or various metals. When buying epoxy resin primer, also make sure that it can be used both indoors and outdoors.



Which is the Best Primer for Epoxy Resin?

If you want to coat a floor with epoxy resin, you should also apply a primer with epoxy resin beforehand, as this prepares the substrate very well for the epoxy paint. These two media form an optimal bond and protect your floor perfectly from chemical, thermal and mechanical stress.


Recommendation Spray Primer: U.S. Chemical Plastics 2K Rapid Primer Filler Gray

U.S. Chemical Plastics 2K Rapid Primer is a high-quality primer specially developed for automotive painting. Thanks to its excellent adhesion, including on bare sheet metal and galvanized surfaces as well as already sanded paintwork, it is the perfect choice for partial painting and spot repairs. U.S. Chemical Plastics 2K Rapid Primer is easy to apply because it comes in a convenient spray can. Thanks to its fast drying, you can quickly and easily prepare your car paint job without spending a lot of time and effort.

U.S. Chemical Plastics 2K Rapid Primer Filler Gray
  • Excellent adhesion, including on bare sheet and galvanized surfaces as well as existing sanded paint finishes
  • Universal, quick-drying 2K primer for high-quality automotive paint jobs. Ideal for partial paint jobs and spot repairs.
  • Ready to spray - aerosol
  View on Amazon


Recommendation for Fiberglass, Wood, Aluminum, and Bare Metal: Marine-Tex RM330K

Marine-Tex RM330K Epoxy Primer is a high quality primer specifically designed for use on boats. It provides an excellent protective coating for fiberglass, wood, aluminum, and steel. With its ability to seal leaking seams and rivets in aluminum hulls, as well as leaks around fiberglass cabins or decks, it helps protect the boat from moisture and damage. The primer’s hard protective layer is flexible and can conform to the hull’s movements to cover and seal hairline cracks. It also fills small cracks and pinholes to ensure the integrity of the boat’s structure.

Marine-Tex Gluvit Waterproof Epoxy Sealer
  • Gluvit barrier coat seals and protects hulls and decks
  • Provides superior protection for fiberglass, wood, aluminum, and steel
  • Seals leaky seams and rivets in aluminum hulls, and leaks around fiberglass cabins or decks
  • Hard protective coating flexes with hull movements to bridge and seal hairline cracks
  • Fills minor cracks and pinholes
  View on Amazon


Recommendation: Speedokote Epoxy Fast Primer

As a primer, we would recommend the BEKATQ 2K epoxy resin primer BK-190EP. This offers optimal protection and has many other advantages:


  • Grey color
  • It is used as a barrier for absorbent surfaces
  • The epoxy resin coating creates an abrasion and water-resistant surface
  • The primer serves as a perfect surface preparation for an epoxy floor paint, but also as an adhesion promoter for various substrates such as tiles, screed, concrete or metal
  • It is ideally suited for indoor and outdoor use
  • The epoxy resin primer is suitable as rust protection for metal
  • You can also use it to fill holes and cracks and bind mortar
  • The epoxy primer is resistant to heavy loads and chemicals; it is even food safe

Despite all advantages we could not discover any disadvantage, which is why the BEKATEQ primer receives an unrestricted recommendation from us.

Speedokote Epoxy Fast Dry Low voc DTM Primer
  • Easy 4:1 mix primer with optional 5-10% reduction with 0 voc reducer (SMR-0075)
  • Can be used as a primer and a sealer
  • Great adhesion to Steel, Aluminum, Fiberglass, Body fillers and Existing finishes
  • Lays down super smooth at 4:1 or with optional 5-10% 0 voc reducer (SMR-0075)
  • Excellent adhesion and corrosion resistance
  View on Amazon



Instructions for Priming with Epoxy Resin

In order to apply an epoxy resin primer on screed or concrete, a few things must be observed. We explain in our step-by-step instructions how to best apply the primer.


Surface Preparation

The preparation of the surface is essential before applying the primer, as otherwise there is a risk of insufficient drying and thus incomplete protection of the substrate. This should therefore be cleaned of all dirt deposits. Remove all grease and oil that has settled on it as well as dust and other dirt. Old coatings should be roughened thoroughly before working with the epoxy resin primer to ensure better adhesion of the epoxy. Afterward, the floor must of course be cleaned again. Flaking paint from an old floor covering must also be thoroughly removed.

If the floor has been newly poured, it must first dry completely. This can take up to six weeks and should definitely be taken into account in the time planning.


Filling missing Areas

After cleaning, the substrate should be freed from all misalignments. It must be completely flat. It is recommended to fill holes and cracks in advance. In doing so, observe the respective drying time of the filler. Screed or leveling compound can also be used instead of a smoothing compound.


epoxy primer sealer


Mix Epoxy Resin Primer

Now the epoxy resin primer for the concrete or screed can be mixed. Here you should observe the exact mixing ratio, otherwise there is a risk of insufficient adhesion and curing. Otherwise, the applied epoxy would remain sticky and would not provide protection for the floor. Please consult the manufacturer’s data sheet for the exact mixing ratio.

Stir the mixture very carefully and also pot it once or twice to ensure complete mixing. As soon as the resin and hardener are mixed, the pot life begins, i.e. the phase in which the epoxy resin can be processed. It must now be worked quickly. Alternatively, you can always mix just a little epoxy resin primer and then more if necessary. This makes the application less stressful.


Apply Epoxy Primer

Use a coating roller or roller to apply the epoxy resin primer to the screed or concrete. Take care not to work in too many air bubbles. Allow the first coat to dry for 24 hours and then apply a second coat using the same procedure. This must now also dry for at least 24 hours. At an ambient temperature of +20° Celsius, the coating is fully loadable after seven days.



Safety Instructions for Working with Epoxy Resin

When working with 2K epoxy resin primer, personal safety must be ensured. Wear a protective suit if possible. If this is not available, you should at least pay attention to long-sleeved clothing.

Respiratory protection is necessary to protect your mucous membranes from escaping vapors. Also, ensure adequate ventilation and protect your hands with disposable gloves.

If the 2K epoxy primer comes into contact with your eyes or mucous membranes, seek medical attention immediately after washing the epoxy with warm water for several minutes. Take the package with you to show it.



Tips and Tricks

If the epoxy primer has been stored in a cold place, you can increase the viscosity and thus ensure more convenient application by placing the container in a large bucket of lukewarm water for some time.

The epoxy should never be stored or processed in excessively hot and humid conditions, as this could impair its positive properties. During the summer months, the epoxy primer should be stored in a cool and dry place.

To achieve a high degree of slip resistance, you can sprinkle the still-moist primer with quartz sand.


An epoxy resin primer is recommended for almost all surfaces, but especially for those that are exposed to high loads. The application is very easy if you follow some basics. We hope that we could help you with our guide.

what is epoxy primer


Frequently Asked Questions


What is the purpose of using an epoxy primer?

An epoxy primer is used to provide a tough and durable base for painting or coating surfaces. It provides strong adhesion and protection against moisture, corrosion and abrasion, making it ideal for use in industrial and marine environments. Epoxy primers are commonly used on reinforced concrete, steel, aluminum and other metallic surfaces. They can also be used on wood, plasterboard and other porous surfaces to prepare an even surface for painting.


What types of surfaces can an epoxy primer be applied to?

An epoxy primer serves as a base for painting surfaces, especially on metals and concrete. It creates a smooth, durable and robust surface that is resistant to corrosion and wear. Epoxy primers also have good adhesion and can provide a good seal for the surface that is applied to it. In addition, they can also play an important role in prolonging the life of structures and buildings by improving their protection against environmental influences.


What are the benefits of using an epoxy primer compared to other primers?

Epoxy primer offers several benefits over other types of primers, including:

  • Durability: Epoxy primer is known for its strong and long-lasting protection against corrosion, abrasion, and chemical exposure.
  • Adhesion: It has excellent adhesion properties, making it ideal for use on concrete and metal surfaces.
  • Water resistance: Epoxy primer forms a moisture-resistant barrier, which helps to prevent the growth of mold and mildew.
  • Chemical resistance: It can resist a wide range of chemicals, including solvents, oils, and fuels.
  • Versatility: Epoxy primer can be used as a stand-alone coating or as a base for additional coatings, making it a versatile option for various applications.
  • Abrasion resistance: Its hardness and strength make it resistant to wear and tear, making it ideal for use in high-traffic areas.
  • Low VOCs: Some epoxy primers have low levels of volatile organic compounds (VOCs), making them a more environmentally friendly option.


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