Step 5. Attaching the Sound Hole Decal Before you put the final clear coats on your ukulele, you may want to install the supplied circular decal around the instrument’s sound hole. The decal supplied is of the “water-slide” type, and is very straightforward to apply. Anyone with any experience making plastic models will no doubt be familiar with the process. Place some room temperature water in a dish and submerge the entire decal until the it easily slides backwards and forwards on its backing sheet. Remove the whole sheet from the water and let the excess water runoff. Position one edge of the decal in the correct position on the body of the guitar, and then gently slide the rest of the decal off the backing sheet and into place. If necessary, fine-tune the decal’s position by moving it with your fingers. Be careful not to tear the decal. When you are happy with the decal’s final position, pat it dry with a paper towel, taking the opportunity to remove any air bubbles and excess water from under it. Let the decal and guitar body dry overnight before continuing.