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The tray can be already painted, or it can be unpainted. You can also use this method on tables, as long as they have a rim or lip of some sort. Craft stores typically carry unpainted wood trays in their wood crafting section. Apply a single coat of paint using a wide paintbrush made from synthetic, taklon bristles. Let the paint dry, then add a second coat if the first one is too thin. Let the second coat of paint dry completely before moving on. This should only take 15 to 20 minutes.  You don't have to paint the bottom if you will be using grout around the bottle caps. You should paint the bottom if you'll be using clear epoxy resin, however. Do not use spray paint. It may be faster to apply, but it will be harder to touch up in the end. Hot glue sets within minutes, but liquid nails and other types of industrial-strength glue typically need at least a day to dry and cure. Read the label on the tube or can to find out the complete drying and curing instructions. You will need to cover the top and inside walls of the tray with painter's tape. You can also cover the outside if you really want to. When you are adding the tape to the inside walls, make sure that you place it just above the tops of the bottle caps. Skip this step if you will be using clear epoxy resin instead of grout. Buy a tub of grout from the craft store, and prepare it according to the instructions on the package. Grout from the craft store is finer than grout sold in hardware stores. It comes in different colors, has a finer texture, and is typically easier to mix. If you prefer to use clear epoxy resin, purchase a kit from the craft store, then mix it according to the instructions in the package. Typically, you mix parts A and B together. If you notice any grout on the painted part of the tray, paint over it using some acrylic craft paint. If you used clear epoxy resin, then your tray is ready to use!
Choose a plain, wooden serving tray that you wish to decorate. Paint your tray with acrylic craft paint, if desired. Wait for the glue to dry and cure. Mask off the sides of the tray with painter's tape. Mix your grout. Touch the tray up, if needed.