I used less than one tube of Vulkum on the roof fixtures. For areas visible from the ground, I used silver Parabond in a squeeze tube. A little goes a long way. I used less than two tubes. I found I could get good results by putting on a tiny bead and then using a cotton cloth soaked in mineral spirits and a fingertip to push it into the seam while wiping off the excess.
This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.