Re "The LST has had one coat of gloss but needs another."
I'm pretty certain that no warship, especially in wartime, would be gloss painted.
Too many reflections and 'glinting' in the sunlight to betray them.
Matt or semi matt/satin would have been the norm in WW2, and still is.
Of course the aesthetics of your model are your affair but for historical accuracy ... 😉
If you use matt paint give it a final spray of satin lacquer to seal it.
Cheers, Doug 😎