Sealant types and uses

Ok, I've read numerous threads about sealants. I'm looking to seal around marker lights, rivets, vents, etc. I'm looking to seal it up for winter. I am going to strip the clear coat off in the spring, so I took lights off and stripped under lights but will need to seal screws and wire holes. I'd like to use a sealant that I'll be able to use for other exterior seals. Vulcum? RTV? etc? What's the best seal on aluminum? This is my first Airstream. BTW its a 69 Sovereign.