Hi guys. I could use some ideas for how to prevent the wood underside of my trailer from rotting. I have a custom built 4x3 covered trailer trailer that was essentially built using the NorthernTool kite found here
An untreated wood plywood deck was created for the floor and a frame built above to enclose and it now looks like this.
So the issue is that a treated piece of wood wasn't used for the floor and the way it was designed, the top cannot be removed to have the floor replaced. The underside of the trailer doesn't feel wet, but it looks somewhat discolored and I'm concerned for the longevity of it.
I thought about using several coatings on the underside of Flex Seal (which I already have) and a caulk sealant such as Weathermaster on the bottom to seal betwen the metal frame and the wood.
However, I'm uncertain if I will potentially be sealing moisture in - or worse if it does get on top, will it be prevented from drying out because of the seal. Would a wood deck sealant be better? Am I overthinking this??