Best varnish for signs

Anybody have any tips for good finishes for signs? Will be applying a clear varnish first and then the paint vinyl wrap, any suggestions on what varnish to use?

If I’m in a hurry, I use Lacquer, because it dries very fast and it’s fairly hard (just expensive). If it’s for high durability I use polyurethane, I also like the fact I can sand it and flatten it pretty easy (it just takes longer). If it’s something that’s going to be around kids or food, I use a water based poly. If it’s something quick and dirty I hit it with a wax stain or boiled linseed.

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