I have a 1990 Honda Accord EX 4 Door. When it rains my trunk gets really wet I checked the taillight seals seeing how this is a common problem and found they were in great condition no cracking looked new.Im stumped on this cause the trunk is wet and the passenger side floor and driver side floor is wet in the front and back.I checked it one one night while it was raining hard to see if i could find a leak and found the trunk seal was missing parts of it and water was around them so i plan to replace that.But the floor being wet i did not find a leak for the sides were not wet just the floor and there was no sign of a leak i checked the windows sunroof everything no sign of a leak just a really wet floor.Anymore ideas?

 

pull up the fake floor in the trunk and look where the spare tire is, see if you have a puddle down there. If you do, then you may have a small hole down there that some silicone will fix.

 

Have you checked the sunroof drainage tube?

 

^Thats my guess