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A concrete surface that has been etched will have a rougher look than one with a finer texture. It should look like 100 grit sandpaper, and it should also be dripped with water. If it isn't, you can check if it's textured enough. Dripping water on the floor should create a dark profile in a matter of minutes. Many single coat epoxy kits come with clean and etch solutions that aren't strong enough to achieve the right surface profile.