If you are installing a resin penny floor as opposed to a regular epoxy one, you will need to grout it. The process is pretty much exactly the same as that of epoxy penny flooring but, instead of calling it a day after gluing your pennies and applying your epoxy, you will have to complete a few more steps. First, you will need to wait until the pennies are completely dry before moving onto your next step. Once they’re dry, you need to grout the pennies using a squeegee. The reason for this is threefold: Grouting helps the pennies stick to the floor better; it creates a seal so that resin cannot leak down between the gaps of the pennies; and it creates a flatter surface, which is very important to a penny floor. Wipe away any excess grout with a soft, damp cloth before vacuuming over the surface to make sure no dust or dirt has a chance to settle. The grout must be fully dried before moving onto the resin. You will need to mix the resin, portion it off into individual batches, and work one area at a time, pouring and spreading approximately half an inch of resin atop the grouted pennies. Leave to cure.