Can these seat lids be waterproofed?

[SailorChlud]

Since we got 3 inches of rain yesterday, I have been wondering - how to prevent all that rain from running under my rear seat hatch into the lockers and then the bilge below?

I would like to cut down on the flow, if not totally waterproof them, so the battery, oil tank and electrical components to be installed beneath have a chance to stay as dry as possible.

I considered running a 3/16ths bead of silicone around the edge to form a lip to keep runoff out.

I have a 1972 Seafari, but these seat hatches are found on several models.

Any ideas?