How do you stop Rain leaks into the booth?

Hunting water leaks is a pain in the tailbone job to do. I'm assuming yours has the jack in the floor of the trunk, under the carpet.
The spare wheel well is the lowest point in the trunk so the water will collect there regardless of where the leak is. Start with the simplest tools, a flash light and the palm of your hand.
How much water is collecting and how fast does it fill up? Rain water coming up through the floor is unlikely unless the floor is damaged.
First take everything out of the trunk that wasn't in there when it came out of the factory. Take a really good look at the carpet and trunk side liners. Use the palm of your hand and feel the floor carpet for wetness. Your feeling to see if it is wet in a particular area. Using the flashlight look for darker patches as carpets often darken in color when wet. Move to the rear of the trunk and feel the liner on the back of the rear seats. Next run your hand over the side panels where the wheel arches are. This will give you clues as to where the leak is possibly coming from.
If the whole trunk carpet and liners are bone dry the leak is from under the car.
All the doors, the trunk lid and the sun roof are fitted with rubber seals to stop rain and road splashes getting inside the vehicle. Over time these perish and start to leak. Run your hand around the underside of the rubber seal the trunk lid sits on when closed. This is the most obvious place it will leak from. You can do this on each door as well because water can travel a large distance before it finds somewhere to create a puddle. A Sunroof can also leak but they tend to cause puddles in the foot well.
If you get a few dry days you can test for leaks with a hose pipe. Keep the trunk closed and make sure the inside of it is totally dry. Remove any spray nozzle from the hose so it flows at regular pressure. Carefully aim the water so it only flows over the trunk lid. Let it flow for a minute or two trying not to soak the doors at the same time. Turn off the water and leave the car alone for about 10 minutes. Wipe off any excess water on the trunk lid, open it and see if its now wet inside the trunk. Yes? the trunk seal is leaking. You can use this method for the doors and sun roof as well. Door and trunk seals are usually just a 'Push on/Pull off' fit so you can easily change them yourself.

Leaking trunk seal or rear window sealer also check the tail lights are mounted properly and that the trunk is closed all the way

hi, get a toch light and hop in the trunk ,then have a friend close the lid with you inside and have them squirt your trunk and car like rain would ,you will spot your water leak pretty quickly using this method ,now you know where the waters entering get a marine grade silicon and block the water till it stops .
THANKS for using FixYa

When diagnosing a water leak, here's a handy tip. Check the accumulated water. If the water is dirty, look for leaks from the underside of the vehicle (floor, wheelwells, etc). If the accumulated water is clean, look for leaks from the topside of the vehicle (trunk seal, window seal, etc). To find where the water is coming from, shut yourself in the trunk with a flashlight and have an assistant run water over the trunk with a garden hose. You may have to remove some of the interior trunk trim to see exactly were the water is coming from, but chances are you'll find it. Also another common cause of water leaks are from impact damage, so check for collision damage repair. while your in there. -hope this helps.

Most of the problems come when its raining and if its not being driven and water still comes in then its the bonnet rubber and if when its being driven then its due to the rear wheel throughing up water under wheelarch and somewhere theres a crack in the weld or somewhere and it will find its way in..
So if not using it clean it out and when rain stops look inside no rain no leak Have a goodday

could be the drains but most likely from spoiler leaking past the seals or wheel wells rusted out or caulk from seams is it when you wash car or rain it rains check it out use a garden hose for water test

Water goes between the front and rear window and is supposed to go through a trough and drain out of the bottom of the car. often the drains along the bottom (4 very small slits) get clogged and water will back up into the floorboards. just drive a flat head screwdriver in these slits and it will let the water out! (watch out about 2 gallons came out of mine!)

U need to carefully check the seams of the sheetmetal for any sign of water or dirt from the road, there is no common leak on these cars, in fact they seldom leak anywhere, the water is most likely splash up from the road, unless u left something out like it was sitting when this water accumulated. Let me know that info.