Resealing our Airstream plumbing vent

Last month,  I posted about our annual “Wash, wax and treat II” job and mentioned that I used a ladder to wash and wax the roof of our 2007 Airstream Safari trailer, while inspecting the roof seals for any signs of deterioration.  Five years ago, I resealed the Fan-Tastic Fan and bathroom air vent seals.  This time around, the plumbing vent pipe seal was cracking and in obvious need of repair.

DSC_0056 Cracked plumbing vent seal

This job needed to be done before the beginning of our fall-winter-spring camping season, so I consulted Rich Luhr’s The (nearly) Complete Guide to Airstream Maintenance, and read that Sikaflex 221 is a good general multi-purpose sealant, especially for roof work such as around vents.  I was reminded that the shelf-life of sealant is relatively short (12 months from the date of manufacture), and of course, my old tube of sealant had solidified.

Airstream Life's Maintenance Guide p

I ordered a new tube of Sikaflex-221 Multi-Purpose Polyurethane Sealant/Adhesive from Amazon and once it arrived, I checked its expiration date (12 May 2016) and gathered my tools: a caulk gun, plastic scraper, isopropyl alcohol (see note below) and…

DSC_0166 Resealing tools

a sturdy ladder (Little Giant*).

DSC_0157 Removing old sealantPlease note that this time inquiring readers should feel relieved that I am standing on the second step from the top and not the first, per the American Ladder Institute.*

Our plumbing vent is near the trailer’s edge, but if I needed to get up on the roof, I would review Colonial Airstream’s video and maintenance tips, “How to climb onto a roof of an Airstream Travel Trailer.”*


I used a plastic scraper (putty knife) to remove the old sealant that was softened with isopropyl alcohol.

(Note: alcohol can prevent the polyurethane in Sikaflex from properly curing, so care must be taken to remove any traces of alcohol by washing, rinsing and drying the prepared surface before applying Sikaflex.)


DSC_0170 Cracked sealant removed

The flange of the Ventline plumbing vent was intact (no cracks adjacent to screws) and new sealant was applied with the caulk gun* and smoothed by my finger.

DSC_0174 Sikaflex 221 Sealant

Now it’s time to get on the road again!*

*Note this is a link to a YouTube video.