I honestly reccomend taking the case apart. A Pop rivet gun is only like $15. And maybe another $5 for the rivets. It will be hard to get in the corners with Powder. ANd, the powder will build up and cover the seams of parts.
Here's a pic of my case I did a few years ago. Took it competely apart. Added alot of hiden features when I put together. Outside is factory, the inside is satin black
