Thanks, Foster and guys...I was wondering if I should Future the entire shell again , not just the spots where the decals go, and then flat-coat, but I wasn't sure...now I know.
. Seems like that's the answer to my problem...and finding out I don't have to thin it is also a big help....Again, thanks from an old WW II infantryman! (I was in Pacific so didn't have to face any of those German Railway guns like the poor devils at Anzio!)