What protective coat would be best for outdoor use?

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I am repurposing cable spools. Some will be outdoor table tops, some will be garden art. Some I will intend for indoor use, but if sold cannot guarantee what they will use them for. Would spar varnish be my best bet? Or a spray clear coat?
q what protective coat would be best for outdoor use, crafts, outdoor furniture, painted furniture, repurposing upcycling
q what protective coat would be best for outdoor use, crafts, outdoor furniture, painted furniture, repurposing upcycling
q what protective coat would be best for outdoor use, crafts, outdoor furniture, painted furniture, repurposing upcycling
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