Caulking gun being used to apply a waterproof epoxy sealer around vaulted glass light pieces.
Chad Randl
2002
<a rel="nofollow" class="external free" href="http://www.nps.gov/hps/tps/technotes/ptn47/repair_replacement.htm">http://www.nps.gov/hps/tps/technotes/ptn47/repair_replacement.htm</a>