Are you guys talking about that expanding foam you get in a can that
expands X amount to fill in cracks around windows

On Sat, 24 Apr 2004 22:52:30 -0500, "Mickey"
wrote:

I see people are using foam to help hold rocks in place and stops leaks. How
long does the foam last ? I know foam is UV sensitive and breaks down in
sunlight. I was thinking of using tubes of clear silicone.