Self leveling sealent

I used the grey butal tape under the lip of my roof vent when I installed it. My roof is .040 aluminum. I am now wondering if I should get some of the self leveling sealant to apply over the mounting screws and to help seal around the vent body itself. I never liked how it always looked just poured on on my rv's, but that wasn't ever visible anyway on those where it will be on my Wee-Go. So what say you?
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