Amazing stuff.  Used it on a through fitting on my boat and countless times on my camper.  Listen up, if you don't use the whole tube,  seal the tip and put in your refrigerator.  Will extend its useful life for months.  Not supposed to hold up to UV as well as 4000UV, but I've tested it with great results after two years.  Although permanent,  it (or objects) can be removed with the careful application of heat.  A little goes a long way and a lot goes a really long way (as it it flows for days).  Very much self-leveling.