The Concrete Outside Is a Different Job
The first thing worth knowing is that what goes down outside is not the same material as a garage floor concrete coating, even though both get called concrete coating. Indoors, in a closed room with a roof over it, epoxy does the work. Outside it is polyaspartic, which is the resin built to sit in the open. That one difference is why an exterior quote should never read like a garage quote, and it is worth asking which you are being given before anyone starts.
It is also why the finish outside has texture in it rather than being smooth. A polyaspartic floor coating outdoors is built up with flake or quartz through it, so the surface has a grain you can feel underfoot instead of a slick face. In a closed garage you can have a smooth floor because nothing ever lands on it. Outside, that texture is part of the job rather than a decision about style.






