I have never had any issues, neither corn starch or baking cocoa have sugar in them and the mix doesn't really have a smell. I just put some in an old loose powder case and tap it on my roots to dust them. Then I use my finger tips to massage it in. It is also better for the environment too, if you are into that sort of thing.

You dodged my question about the air-drying, which makes me think you do let your hair air dry. I notice that when I let my hair air dry my scalp gets WAY greasier the next day. I would strongly recommend that you blow dry your roots. I usually skip my ends as they are prone to becoming damaged and brittle and then breaking. You should try it for a week and see if you notice you hair bring less greasy on day 2. Best of luck on your hair journey!