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I've used satin all right but the OP wants gloss anyway.
If I'm spraying on to acrylic paint I use the household polyurethane spray you can get at DIY shops. The brand name in the UK is Plasti-Kote.
If I used pens on the model, particularly metallic ink, I paint over that part first with acrylic gloss varnish. This prevents the solvent in the spray varnish from making the ink run.
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