Applying a decal of any sort is always easier with the right tool. This is the most common squeegee, a very inexpensive tool in this industry. They come in many colours, varying degrees of hardness, and some different sizes, and even more in entirely different shapes for different jobs. Whether you are applying decals from a dollar store, or some high quality vinyl from me, this is the tool you want. The harder plastic squeegees are better for flat surfaces, while the softer more pliable ones are great for slightly curved or uneven surfaces. Using these correctly, you both ensure you avoid air bubbles under your decal and the adhesive is securely bonded to the surface you are applying it to. Squeegees are available in my online store here.