Classic tail light gap?

[cornish6544]

So I noticed this with my old Lexus style lights that there is a gap which allows water in so I sealed it with glue on my old lights but now I've got the new sti lights I've noticed there is still a gap , is this just a bad design? Think I should just seal these new ones again?

[savage bulldogs]

 

Rear lights on a classic are sealed with some sort of mastic from the factory.

 

It's weird stuff they use as it never drys and I got fooking covered in the stuff when removing the lights on my old v3 uk lol

 

Just had a better look at the pics , the outer black plastic always has a gap but the lights back plate is sealed into the bodywork with the sticky mastic stuff (when you fit the lights into the car )