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As it turned out the roof on mine was easy to seal - just a blob of silicon on each screw hole.
Took me a lot more goes to get the walls sealed up. Because I've got a wood base, I wanted to seal the gap between the channel and the wood base, to prevent hidden water and rotting. However, this helped keep the water in.
Then when sealing the outside of the channel, even a small leak inside would just store water up until it leaked everywhere inside. More and more silicon eventually solved the problem, though it seemed to get worse before it got better. The door was a particular problem.
I've tried to keep the inside reasonably silicon free, since it at least lets you see if there is any water ingress, rather than hiding it away where things rust and rot.
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