Long as the base coat is 100% cured.
If in doubt paint a scrap styrene plastic part the same way you plan on painting your model, this way if things go south you have not ruined your model.
Best to use a spray (airbrush or can) for clear coats. Future acrylic floor polish can be brushed on with excellent results as its self leveling and very forgiving.
Just work fast with a light touch, with a base coat of acrylic you do not want to over work the surface.