Installation of the Trav'ler

Very good information in the posts above. Just be sure you don't mix Dicor and Silicone caulk as mentioned above. You can use one or the other to do the entire job but you don't want to use one for some of it and another for the rest. The 2 types are not compatible and will not stick to one another.
If your dome is current installed using a silicone based caulk (and the Trav'ler will be installed at or near that location) I would use silicone for your Trav'ler install. If that's not the case, I recommend Dicor self-leveling caulk for the entire installation. 2 tubes will get it done.