I found if it's condensing on the hatch, it's also condensing on through deck bolts and running down in between the layers of the saloon roof, and on to my electrics. I got the Seal in August and after fixing all the leaks in the deck, i still kept getting water running out from above the chart table. I looked and looked and checked but couldn't find a leak. It only completely stopped once i reduced the humidity.
I second Neil's absorbing tray suggestion, along with: Fixing all leaks, opening the companionway hatch when making a cup of tea and running the diesel air heater(intake air from outside) as often as you can if you have one.
Apparently(I've not tried it yet), a bucket of rock salt works as well too. At 22p/kg from a well known DIY shop it comes in a lot cheaper, and buckets hold more water, so require less frequent emptying.
Lee
Seal 28
Whiskey Mac