[GpsFrontier]

I'm not sure what you mean by "longevity increase". But as far as constructing the hydro system, it's important to make sure you don't make holes in the plastic during constructing it. But as far as the overall projected longevity, I can tell you the 6ml plastic is construction plastic that is used in all parts of construction. Including being a moisture barrier and intended to last many decades. As far as the "contact cement" longevity, that to is intended to last decades, it's typically used for laminating counter tops and similar cabinetry. As far as the OSB longevity, it's the main wood used in house construction. As long as it's kept from moisture it will last a century or more, if not it can decay immediately if the wood is saturated.

Of coarse the vinyl tile adhesive is also intended to last for decades, being used to adhere tile to floors. The particular "VCT" adhesive is mostly used in commercial buildings, including hospitals. However the vinyl tile adhesive is only water resistant (not water proof). So that means it's water soluble and that you need to pay attention if you damage the 6ml plastic. But depending on how bad the damage is (pinhole, scratch, tear, etc) it can be simply patched various ways (silicone, hot glue, marine goop, etc.), and it would only be a problem if was below the water line in the system.