All I can say is using my method on my Skybaby's interior it is not at all shiny.
-My application method-
1.-If a surface is dirty clean & dry it first before applying the protectant.
2.-Spray a little 303 onto a foam applicator or an "edge foam swab applicator"
3.-Wipe it onto the surface (Quick, easy, & FUN!)
4.-After applying to surface wait 2 to 5 minutes from your start time.
5.-Thoroughly dry with a clean dry microfiber detailing towel using the same starting point.