Hi all, total beginner here. I’ve started my first build and I seem to have an issue with my nitro sanding sealer. When I stripped the original paint off I made some gouges in the wood, so I filled them with wood filler. After filling, sanding and spraying sanding sealer there are areas where the filler doesn’t seem to be accepting the sealer. I noticed after drying for 48 hours or so the sheen is dull and flat where the larger areas of filler are compared to somewhat shiny sheen where it was bare wood. I sanded the sealer off and was hoping for suggestions before I try sealing round two. Any and all suggestions would be very much appreciated. Cheers.