I'd second the recommendation from Guz, Gloss Coat would probably be fine as its so easy to apply but as he said its not really a step up in terms of durability, CSL or CSL + EXO is a good choice for 1) easy to apply 2) should be about as durable as you can get without the commitment of having to go "pro" and not have the added pressure to maintain an account/partnership with a specific manufacturer....unless your business can support it of course.
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