I'm in the process of my first build. I used way too much Great Stuff, but it turned out okay. I let it sit overnight and started cutting holes into the great stuff for plants and the inside is still gooey. My question is, should i coat the inside of the holes with silicone? With Great Stuff being as porous as it is, i'm concerned about mold growing inside the Great Stuff background. Is that possible? I wanted to put soil directly into the holes that I cut out. What is the best way to go about this? Is drainage necessary if i keep my monsoon system at a low duration more frequently? Because I don't know how I would create drainage at this point...
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