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Silicone being a generic term in this sense. The stuff I'd actually use is PL-30. I'll do a test seam with it and see how it holds. I think Addy has used it extensively with her rpe liners.be careful with the silicone (as I've been finding out) because it doesn't always stick to some plastics. That is, it WILL stick initially but I've found it is peeling off really easily (working with pvc; not sure how the epdm/hdrpe will do).
View attachment 145101
Did the unthinkable today and started cutting the liner again!