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If you are working an a small piece, you don't need to do this. If you are working on a larger piece, however, you will need to upgrade to a larger brush. Pouring the Mod Podge into some sort of container will make it easier to access. Bowls, clean and empty yogurt tubs, and plastic food containers (ie: Tupperware) work well for this. You can do this with a flat, wide paintbrush, a foam brush, or even a foam roller. Be sure to cover the entire surface, from edge to edge. If your paper is thick and sturdy, it would be a good idea to apply a thin coat to the back as well.  If you are applying Mod Podge to your paper, work on a larger piece of scrap paper so that you don't get your work surface dirty. If you are covering multiple sides on your object, choose one side to work on first. Set the paper lightly onto the surface first. Nudge it into place, if needed, then gently pat it down. Use a squeegee for small objects, or a rubber/silicone roller/brayer for large objects. Work your way from the center of the object outward.  Mod Podge makes special rollers for smoothing down paper. You can typically find it alongside the other Mod Podge supplies in the arts and crafts store. If any Mod Podge leaks out from under the paper, wipe it off with a damp paper towel. Let the paper dry for 15 to 20 minutes first, then apply a second coat of Mod Podge on top. It is very important that you wait, otherwise the first layer won't cure properly. If you have any overhanging edges, trim them off now with a craft blade. You can also sand them off with sandpaper. If your paper had a pale, subtle, or simple background, you can make it look more interesting by Mod Podging shapes cut from other scrapbook paper on top. Make sure that the shapes work with your design, however! Here's what to do:  Choose a paper with a large pattern on it, such as birds or flowers. Cut the individual birds or flowers out. Apply Mod Podge to the back of each shape. Smooth the shapes onto your covered wood piece. Overlap shapes for an interesting effect. As before, keep these layers thin. Allow each layer to dry before adding the next one. Once you apply the last layer, allow it to dry completely. Mod Podge typically has a drying time and a curing time. Refer to the label on your bottle for specific times. If you are Mod Podging paper to a box, you can apply the paper to the other sides. Use the same method and technique as before, working one side at a time. You can do two sides that are opposite each other, as long as they are not touching anything. You can leave your Mod Podge piece as-is, or you can embellish it further with buttons, fake flowers, or ribbon. Make sure that the embellishments go with your design, however.  For something simple, use paper scrapbooking embellishments. Peel the baking off of the foam sticker on the back, then apply it to the piece. Outline larger shapes or edges with glitter glue. If you don't have glitter glue, use regular white glue, then sprinkle extra-fine glitter on top. Apply a light layer of white paint with a dry brush for a vintage look. Thread embroidery floss through the holes on a button, then glue the button to the piece so it looks stitched on. Mix extra-fine glitter into Mod Podge, then apply a final coat for extra sparkle.
Pour the Mod Podge into a bowl or container, if desired. Apply a thin coat of Mod Podge to the wood piece. Place the paper onto the Mod Podged surface and smooth it down. Allow the paper to dry before adding a second coat. Add some cut-outs, if desired. Apply two more coats of Mod Podge, then let it dry completely. Finish the other sides, if needed. Embellish the finished piece, if desired.