Use an outdoor grade sealer or finish
If you don't use the Zinser specifically, you can use any outdoor grade product. Any kind of deck sealer should work. They all have UV resistance, and contain moldicide and fungiside.
I don't think it should be a problem if your hood is ventilated, but you may want to wait long enough for the canopy to completely dry (days as opposed to hours) for the volatiles to dissipate.
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