are you supposed to sand epoxy?

I’ve been wanting to do some repairs on a set of stairs in my house, but I’m not sure how to go about it. I know epoxy is supposed to be super durable and long-lasting, but I also saw somewhere online (and can’t find it again now) that you’re not supposed to sand epoxy before clear coating.

So I’m trying to figure out whether or not I need to sand the epoxy first before applying another coat of epoxy overtop it.

Do you sand epoxy before clear coat?

You don’t need to sand epoxy before clearing coating, but it will make your life easier. It is possible to sand epoxy after the clear coat, but you will have to sand more than once.

If you don’t want a lot of extra work, then I would recommend sanding before applying the topcoat.

If you are doing any shaping or detailing on your project, then it’s likely that it will be more time-consuming than usual because of all the extra steps involved with working with epoxy.

Will sanding epoxy scratch it?

Sanding epoxy is a delicate process. It’s important to know that sandpaper will scratch your epoxy, so you have to be careful about what type of sandpaper you use.

You should also know that steel wool will not scratch epoxy, but it will leave a residue on the surface. The more you sand, the more likely it is that your project will get scratched as well as roughing up the finish of the epoxy.

How do you make epoxy clear after sanding?

  • Sanding blocks. You can use a sanding block or sponge to smooth your epoxy floor after it’s dried. You’ll want to make sure you have a sandpaper grit that’s appropriate for your project: coarse (60-grit), fine (120-grit), and very fine (220-grit).
  • Sandpaper discs. If you have a power sander, it may come equipped with an attachment that allows you to attach paper discs instead of sheets of sandpaper. These discs will come in various grits; choose one based on the size of your surface area and how much finish work needs to be done.

What grit should I use to sand epoxy?

It’s important to use the right grit of sandpaper. You don’t want to use too coarse a sandpaper or you’ll end up removing more material than necessary. You also don’t want to use too fine a grit because it can leave scratches in your epoxy.

The ideal sanding procedure involves using a piece of 150-grit paper mounted on an orbital sander with three different backing pads: 80, 120, and 240 grits.

If you don’t have an orbital sander, then these steps will work just as well for manual sanding with any old piece of paper that you happen to have around. Just be sure not to skip any steps!

The first step is always going over the entire surface area with 80-grit paper mounted on your orbital sander/manual tool (or handheld if using regular sheets).

This will remove any high spots or low spots caused by building up too much epoxy on certain areas—not enough on others—and create a generally even foundation upon which we can build our finish coatings later down the road (if desired).

Why is my epoxy bumpy?

One of the most common questions we get is, “Why is my epoxy bumpy?” The answer depends on the epoxy you are using and your specific application. Some types of epoxy are very hard and cannot be sanded or ground down for a smooth finish.

If this is the case, then you will have to seal the surface with an appropriate resin or coating before painting over it.

How do you smooth out epoxy?

  • Sanding block
  • Fine grit sandpaper (I prefer 120-150)
  • Random orbit sander (I use a Bosch ROS20VSC)
  • Dremel tool with sanding disk attachment

How long should I wait to sand epoxy?

When you’re working with epoxy, don’t dawdle! You should sand epoxy as soon as it is dry. Sanding before the epoxy has fully cured can damage the surface and make it difficult to apply finish coats.

Also, sanding with a very fine grit makes for smoother surfaces and less visible sanding marks. If you’re not sure what kind of grit to use for your project, err on the side of caution; it’s better for your project if you use too fine a grain than a too coarse one.

Finally, always use a light touch when sanding; if there are any raised areas left by harsh or heavy-handed handling then they will show up under future coats of paint—and nobody wants that!

Can I epoxy over epoxy?

It is possible to epoxy over epoxy. Epoxy is a good choice for a topcoat, especially if you’re using it on top of another protective coating like varnish or polyurethane.

Epoxy can also be used as a clear coat or final coat in many cases, but not always. It all depends on what kind of project you’re doing and what kind of surface you’re working with.

The main thing to keep in mind when working with epoxies is that they have different levels of sheen: some are more glossy than others.

You can adjust the sheen by adjusting the ratio between your two components during application (more catalyst will produce less gloss).


In short, you can sand epoxy but it’s not always necessary. It depends on what your specific project requires and how rough the edges are after application.

If you’re looking for a smoother finish with fewer imperfections then sanding before a clear coat might be worth considering. But if not, then don’t worry about it!

As long as there aren’t any deep scratches or other imperfections then the final product will still look great when finished with a clear coat.

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