I'm probably the only one who had luck using Krylon Matte Finish - but only as a sealer. It had no tooth at all and although it says "matte" there is a sheen as if I didn't spray anything at all. I have stored the sprayed pieces on my desk which is the dustiest place in my room and the dust didn't stick to them. It's been a year and the pieces are not sticky as some people find happens with Krylon. The can describes it for use on art, crafts, display items and "many other things" but for face-up purposes I didn't find the product too useful.
I have used Model Master Clear Flat Finish and although it stinks really bad it gave a noticeable tooth. The can is very small and it cost about $13 at the time. It runs out quickly but it is a welcome alternative.
When MSC was still legal to ship internationally (I live in Canada), I had the opportunity to try it and how I wish I could get my hands on some again! It has a smell but it's not unpleasant. I wouldn't recommend it for tanned resin because after a few layers it becomes whitish, making the end result look like someone with too much foundation on.
It would cost me $40 for a single can of MSC due to the outrageous shipping costs.
Sadness.