How do you protect the floor during a project?
For protecting the floor of your project workspace, use 4 mil painters plastic.
Place it down around any area you're working in. This will prevent the epoxy from making contact with your floor surface.
If epoxy ends up on the floor but is still wet, you can use acetone to clean it up.
If the epoxy has accidentally cured on the floor, you'll have to chip or scrape it off to remove it.
Caution: Do not attempt to use cardboard! Epoxy resin can soak through cardboard and will pass onto the surface beneath it.