We've already sealed cracks in basement walls and floors, and painted on RadonSeal. But we got a reading of 2.7 recently it's not dangerous, but it's above 2. We keep two fans on, and in good weather can open windows and doors. Now, it's 26 degrees F and I'm wondering if I should do something else in addition, since we aren't going to be opening windows and doors regularly!
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remove the tail light, and check the seal and the light seal should be clean and you should be able to squeeze it a bit, the light cas should have no cracks or splits in it, if it has use clear sealer or clear glue to seal the cracks etc. also check around the light frame where the light fits to the vehicle, look for damage like rust of debris from the road etc clean the area, remove the rust if there is any and fill with paint filler putty, leave to dry and paint the area and leave to dry.. when dry repth the light cluster. and check the seals on the bulb holders if there are any on your model. if warn or cracked replace them, they usually come in an O ring kit.
Just a guess, but it is likely that moisture is causing the paint to peel. I suggest you remove as much peeling as you can with a wire brush and then use a waterproof sealant. I had very good luck with a product they sell to seal cement walls in basements with moisture problems.
if you don't want to take unit out. use an old tyre inner tube, cut it open and cut it so you have enough length including an inch extra, spread the selent on to the tube you just cut and using a metal like ruler or long metal fold over on end and push it and the rubber with the selent on it along the crack and through the fire wall. then when you have made it through the fire wall pull back the metal and leave to dry and set. if its a round area use a flexible plastic, bit harder to get it lined up to go through but still the same. this will seal the crack and make a new seal on the fire wall so any water that does come out will go out side were it should be going.
Alot of cars have plugs in the floor and are sealed with either undercoating or a type of caulk.over time the seal dries and cracks up letting water in. Raise the car up and find the plugs and reseal with a good silicone caulk. Plogs are usually a oval shape.