Everytime it rains my trunk is full of water, I do not know what to do in order to stop it, any suggestions would be of great help thanks.

 

i had this exact same problem. there is a weld along the trunk (it runs perpendicular to the side trunk seal) mine had separated just ever sooo slightly to allow water to seep inside. can be tricky to see, as part of it is underneath the seal. peel back the trunk seal and you should see it. just weld it back up or use a sealant on it.

if that isn't the problem then it could be a couple of things, a malfunctioning drain (located at the drivers side of the trunk under the little hatch light)
a disconected antenna drain, faulty window seal, bend in the metal seal lip that holds the main trunk seal etc. etc.

 

The water is coming in from the rubber around the trunk, or from your tail lights. You can replace the trunk rubber, but it's not cheap, or you can just use some silicone and go around the rubber and re seal your tail lights.

 

Thanks guys that acutally helped a lot

 

Do you have a sunroof that is another thing that could be causing the the drain piping on the right side may have come loose, you may want to check that if the other two options don't stop your leak. I switched my gasket foam with each other as a temp fix until I find another type of material to cut into a gasket. (right to left. left to right)