I've used a wooden kabob skewer, an orange stick (for pushing fingernail cuticles back), a bent end tweezers and a flat screwdriver to help push edges into place, when glue basting applique shapes. Also using your thumb and index fingers works too, with a pinching motion, especially for gentle curves. Whatever works. Many times you can make do with things you find in your house and you won't have to go buy a tool.