"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.

EP Henry has a sealer for use around pavers that works well in this
case. You can use silicone, but make sure you get the exterior glazing
grade of silicone that won't degrade or discolor.

http://www.ephenry.com/store/product...32&pf%5Fid=adh

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