Clear waterproof agent that can help to protect MDF board or plywood from expansion when contact with water?

Timber door %26amp; door frames construct with MDF board or plywood substrate when come in contact with water at the bottom either embedded or siiting on the finished flooring, it will swell in no time and causes damages to the asthectic look.Clear waterproof agent that can help to protect MDF board or plywood from expansion when contact with water?
Yeah yeah, silicone it, put a moisture barrier whatever. Why is the frame in water? It seems to me that keeping moisture away might be a goal. If that's just not possible, I would probably consider a spar or marine varnish. The problem is the porosity of the wood. Plywood would probably take more, mdf is fairly dense, but you need to seal the wood at the bottom. You'll probably want to do more than 1 of the options you will end up with.Clear waterproof agent that can help to protect MDF board or plywood from expansion when contact with water?
place a plastic film underneath the floor to prevent the moisture and water to damage the floor from below
Clear Silicone, buy it from hardware store