in a large bowl, combine soy sauce, sugar, honey, garlic powder and dry mustard. add wings and toss to coat in marinade. cover, refrigerate for at least 1 hour.
preheat oven to 400*.
remove wings from marinade and divide on 2 greased bakings sheets and bake 30 minutes.
meanwhile, boil marinade in a saucepan over med-high heat until syrupy. remove wings from oven; reduce oven to 350. baste wings all over with reduced marinade. return wings to oven bake until glazed and a little crispy, about 30 minutes more. serve.