Preparing Ducts for Paint

Went a little crazy with the filler today probally way too much and over everything when i really didn't need to.

Took me ages to sand them all back but afterwards i put a coat of primer on to see if there where any pin holes and re-do any sections i needed to.

I was going to leave them and to be honest they would be fine but there was some small lows after sanding and i wanted to even them out a little and make smooth even though you won't even see it.