do you need to sand before epoxy?

Epoxy is a popular flooring material, but it can be difficult to work with. There are many questions about how to do the job correctly, and sanding before epoxy is one of them.

I’m going to answer your question, “Do you need to sand before epoxy resin?” and explain why this step is so important when applying epoxy.

Can I epoxy without sanding?

You can epoxy without sanding, but it is not recommended. The reason it’s not recommended is that the epoxy won’t adhere properly to the wood and will not fill up the pores of the wood.

Why do you have to sand epoxy resin?

Sanding epoxy resin is a necessary step in the process of priming and painting your epoxy floor. Here’s why:

  • Sanding removes any imperfections on the surface, such as dust, dirt, or loose particles. It also smooths out any bumps or uneven spots on your floor. If you don’t sand first, these imperfections will show up when you paint or stain your floor later. That can make for an unattractive finish if it isn’t done well!
  • Sanding is also used to remove some of that initial layer of resin from your floor so that it has more even layers underneath (typically about one inch). This will help give you a smoother finish for when you apply new coats of epoxy coatings in future projects.

Can I sand first coat of epoxy?

No. The first layer of epoxy is going to fill in any sanding marks that you might have made, and it’s best to let it dry completely before applying the next coat.

If you feel like your area needs some more texture or if there are still visible imperfections after the first coat of epoxy has dried, wait until after the second coat is applied and cured before sanding down again.

If you still feel like something needs to be done at this point (and remember that every project is different), go ahead! Just don’t forget that there’s a chance that using too much force will cause bubbles in your surface as well as damage its strength—so proceed with caution!

How do I prep my floor before epoxy?

Before you begin, you’ll need to make sure your floor is clean and free from dirt, grease or wax. If there are any stains on the concrete floor that won’t come off with soap and water, then use a cleaning solvent like acetone or mineral spirits to remove them.

You can also use a product like Scrubby Blocks by 3M to remove stubborn dirt and grime from your concrete floors.

If your concrete has been treated with wax or oil—like linoleum—you’ll want to remove those before applying epoxy.

Why is my epoxy bumpy?

You may have noticed that your epoxy is bumpy and not smooth. There are a few reasons why this might be the case:

  • The epoxy applied was too thick.
  • The epoxy was not mixed properly.
  • The epoxy was not applied properly (too heavy or too thin).
  • The epoxy was not cured properly (see below).
  • The sanding job on your surface was insufficient.

How do you make epoxy clear after sanding?

Use a fine grit sandpaper and sand with a block, sponge or machine.

Use a belt sander on the edges only and an orbital sander everywhere else.

Use a drum sander to take down all edges of the floor, then use an orbital sander over the entire area to remove any marks left by the drum sander.

How long should epoxy set before sanding?

The time it takes for epoxy to set depends on a few things. The first is temperature, humidity and thickness of the epoxy.

If you’re working in sub-zero temperatures with very dry air and applying a thin layer of epoxy you can expect your work to set within 24 hours or less.

The opposite is true if you’re working in Arizona in the middle of summer with very high heat and humidity and using thick layers of epoxy; then it may take up to 3 days or more before your project has cured enough for sanding to begin.

Does sanding resin scratch it?

When it comes to sanding resin, there are a couple of options. You can choose to use a foam pad or sanding block. The benefit of using either of these is that they won’t scratch the surface of your epoxy and will help to create an even finish.

However, if you’re looking for something more precise, then you’ll need something like a power sander which can be used on smaller areas more effectively.

However, there is one thing that all three methods have in common: They all require some form of lubrication before being used on the exterior surface of your wood project (this includes both marine and non-marine type epoxies). This helps keep grit from embedding itself into the wood fibers beneath where it could cause damage later down the road when finishing up your project!


Epoxy is a great product for both professionals and DIYers. It’s easy to use, low-maintenance, and tough enough for any job.

Sanding before epoxy application is generally not necessary unless your floor has a lot of imperfections that need to be filled or removed.

If you want an even coat of epoxy on your floor, you will need to sand it down first so there are no bumps or divots on the surface.

While this may seem like extra work at first glance (and sometimes even during), it will save time and money in the long run because there’ll be less chance of needing touch-ups later on down the road!

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