I see what your getting at now, mine is actually sealed behind the lights where you mentioned with non-setting sealant and still water found its way in, it doesn't now Ive put a rubber seal on.

 

But did you remove them and replace the sealant? The stuff Subaru used isn't that good, and was somewhat randomly applied.

This is the best stuff:http://www.caravan-components.co.uk/...-in-400ml-Tube

Made to seal the seams of caravans and where the awning rail is screwed to the sides.

 

took it to the mechanic was told to park nose uo my driveway I'm still here though looking for a permanent solution. Apparently the was the impreza was made was like they didn't think to make like a trench for the water to run down the back of the car and onto the road. He said the water collects there and the seal can't hold back the water when it's pooling up

 

An update...

If you are getting water ingress because of old, knackered sealant for the rear light clusters -- or have had new clusters put in -- then forget new sealant.

ICP and RCM now do modern day neoprene seals. I had a new OSR cluster fitted using one and it seems to be working fine. Obviously, the 'art' is to scape off the existing sealant as best you can, and cleaning up that area for a perfect seal.

The two seals in the kit are 'handed', but if you flip them over, then either seal can be used for either cluster. Obviously.

 

I had the cluster fitted a few months back with the neoprene seal. No water ingress whatsoever!!!