I've dealt with this with s13 coupes, but the concept is likely the same...places it could be leaking through are the antennae hole, the taillights, and the side markers...there is something called butyl tar sealant (you can get it from your local auto paint store for like $10 for a box that will do 20 cars worth of seals. I'm not sure on the lifespan of the sealant but your's is already 8 years old minimum so there's a good chance some of it is shot.
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