[TowerTalk] RTV

[Barrie - Yellowstone Photo]

Hello:
 
Need some advice on RTV.  I have a tube of Dow Corning 3145 which I was planning
to use today.
However, upon opening it I discovered that it has become too thick to flow.
 
I was planning to put an antenna up this coming Saturday, so I don't have time
to order something
exotic.  Is there something I might find at ACE Hardware, or the big box stores
that would be okay
to use?
 
TIA & 73, Barrie, W7ALW