Caulking the vertical seam with a Harbor Freight air gun. Quite admittedly, the seams were not caulked nearly hard enough, as this was our first attempt at the process. The inner edge of the lap will be caulked again at the next work session. Having no scuba gear, we were unable to do it the day of the photo! The outlet on the tank will be the source for rail wetter water.

Photo by Chad Thompson