Do I need primer before epoxy?

“Do I really need a primer before epoxy?”

This is a common question asked by many, especially beginners when it comes to the garage floor coating and restoration process. The answer to this question is actually very simple: no! You can use epoxy without using a primer first and still get fantastic results. Keep reading to understand why you don’t have to use a primer to get excellent results with your epoxy project.

What kind of primer do you use before epoxy?

What kind of primer do you use before epoxy

Epoxy primer is an excellent primer for your car. An epoxy primer can be used on bare metal, and provides exceptional adhesion. Epoxy primer also provides great corrosion resistance.

Epoxy primer is a bit thicker than other types of primers, so it is spread evenly before applying the first coat. It’s best to avoid using thinner or reducer with the epoxy primer, although you may have to do so if you’re spraying in hot weather conditions.

Can I use any primer for epoxy resin?

The short answer is yes, you can use any kind of paint primer with epoxy. You just have to make sure that the primer is compatible with epoxy resin. Depending on what brand of epoxy you are using, they may recommend a certain kind of primer. It is best to follow their instructions, but if they do not mention a particular type of primer or sealer, then you can use whatever kind you prefer.

Epoxy is a two-part resin system meaning there are two different materials that come from different containers and need to be mixed together in order for the epoxy to become active. Depending on your needs, there are several different types of epoxies available: castable (water clear), laminating (high strength or waterproof) and infusion (suited for high performance applications). The type of epoxy/resin will determine which type/brand of primer you should use.

Should I prime my garage floor before epoxy?

Should I prime my garage floor before epoxy

You should prime before epoxy because it will help the epoxy stick.

What else is important to remember before starting? Well, it’s best to prepare your floor with an epoxy primer before you get started. This type of primer for a garage floor is designed to increase adhesion and ensure that your new coating lasts as long as possible.

How do you properly prep your garage floor for an epoxy coating? First, remove any existing sealants and coatings from the surface. Then, clean the concrete thoroughly using a degreaser and a heavy-duty scrub brush—a power washer works well here, too. Finally, allow the concrete to dry completely—typically 2-3 days—before applying primer.

Why do we put epoxy primer before painting?

The purpose of primer is to apply a surface that supports good adhesion and provides a uniform base. Primers can also protect metal surfaces from corrosion, provide waterproofing, and act as a sealant. A coating of primer before applying paint reduces the chances of flaking or peeling and promotes better adhesion on porous surfaces.

Primer is also useful for stain blocking. Stains like smoke, nicotine, and water seep into the substrate (the surface you are painting) through the pores in the material. The stains then oxidize and bleed through your final finish layer if not blocked by a quality primer first.

Not only does epoxy coatings provide superior adhesion properties when compared to other primers, but it also offers better corrosion resistance because of its chemical makeup. Epoxy resins are very rigid polymers with a strong bond between their molecules, making them waterproof and impermeable to air or liquids. They therefore make excellent moisture barriers that protect steel from rusting by preventing moisture from reaching the surface of painted metal parts while also providing an ideal foundation for topcoats to stick to.

What primer should I use for resin?

What primer should I use for resin

Whether you’re working with covered or uncovered pieces of epoxy, using primer is a must. It will help the resin to dry more quickly and evenly, resulting in a better finish. Plus, it will keep your work from becoming sticky.

Do you need to seal epoxy?

For the sealers, a primer is recommended as a base coat. This will help prevent any epoxy that might remain sticky after curing and it also helps create a better bond with the sealer.

Some of the popular brands include Rust-Oleum, POR15 and Kilz, among others.

How do you prepare concrete for epoxy coating?

How do you prepare concrete for epoxy coating

We want the epoxy to stick. We want it to last.

In order to make this happen we need a good clean surface. Here is how we do that:

  • First, sweep or blow off the garage floor with a leaf blower.
  • Second, use a degreaser and scrub down the concrete floor with a deck brush.
  • Third, rinse off the degreaser using a hose & sprayer nozzle (like those made for car washes).

Lastly, let it sit overnight and dry completely before you begin your epoxy coating project.*END OF SECTION

Do I have to sand epoxy primer before painting?

It is very important to sand the epoxy primer before it dries. A primer that dries in the previous coat cannot be sanded. It just rubs off. The reason you want to sand your primed surface is to remove any imperfections left by the primer and flatten it out so that your color coats lie flat on top of it. When you spray a coat of paint, a tip called a “tip out” occurs at the end of each pass where more paint is laid down, resulting in an elevated surface when you look down from above. If this layer is not uniformly leveled, it will result in an uneven sheen which is undesirable for most consumer-grade paints and clear coats, especially black finishes!

The best way to make sure your epoxy primer is smooth after an application is by using a proper sanding block with 240 or 320 grit paper. Don’t use a hard block or some other makeshift device as they can leave their own marks on the bodywork and undo all of your hard work from grinding and filling imperfections!


So, to summarize, the answer to the question “Do I need primer before epoxy?” is yes. Primer helps epoxy adhere better to the substrate. You need to use the correct primer for your particular kind of epoxy; if you don’t, you may have problems with adhesion and durability.

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Martin Flood

Martin Flood has been working in the construction industry for over 20 years as a general contractor with expertise in remodeling projects that are large or small. He has furthered his career by specializing in epoxy resin flooring, providing excellent service to both commercial and residential clients. Martin’s experience enables him to offer professional advice on how to choose the right type of project based on your needs and budget.

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