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Bought a Hymer B644 in September 2015 after a few week at home left on the drive I discovered a bit of water on the rear window after we had a heavy downpour so decided to investigate more to see where the water was coming from we discovered it was coming though the sealant on the brake light at the top of the van I couldn't believe how much sealant was holding the light in just be aware a lot of these motorhome manufactures scimp on sealants around lights & bike racks motorhomes are like boats when you start drilling holes in them it's all been sorted now & put back to normal here the results of the water damage