In most paints you have a volatile portion(solvent) and a "solids " portion, which it what forms the film after the solvents evaporate. So, for example, a "medium solids" clear might be 33% volume solids or so, which means if you apply 3 mils wet, 2 mils of the wet paint will evaporate, leaving you with 1 mil dry film thickness. Let's assume your high solids clear is 50% solids, you would only have to spray 2 mils wet to get the same dry 1 mil film thichness. Net result is more coverage at a given film thickness with higher solids. You won't necessarily need a smaller tip to spray high solids, will probably depend more on the viscosity of the clear, but if you went with a slightly smaller tip(or adjust your fluid delivery at the gun) it will be easier to control your film thickness. Hope this helps.
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