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I have used a paintable latex caulk to seal the joint. Ive found this works good because I can paint over it when adding groundcover, and it peels away relatively easily without damaging the foam if I want to make any changes (which I have and I will!) or if I need to takethe layout apart. Other times Ive found if the gap isnt too big, the ground cover fills the joint enough that it cant be seen. Good luck.
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