I use small particle makeup quality for touch ups. It has a very fine particle size that matches the originals very closely. Thin layers in thinned down sealant. You could also use the wet and sprinkle method, though this is a little less controlled (I don't like glitter everywhere!!) Paint the symbol with a thin sealant then sprinkle glitter. Lightly tap pony, then gently press glitter into symbol with brush or gloved finger (so you don't have rough glitter). I would seal after either process to prevent glitter loss