[sailingfool]

Whether your proposal makes any sense really depends on how wet the core is...if there is only localized moisture around some of the mounting screws, your approach may stabilize the damage to what exists now. Skip the Get Rot idea, as SD mentioned its for dry damage. If your deck core is very wet, say 20% or more, all you will achieve at best, is to encapsulate what water is already there - you will not fix any existing damage. Sounds like a half sized solution to me.