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Owen I have come across this problem many times especially on older range rovers. the rear window and tail gate are two separate items . now the tail gate especially has problems on the lower hinges and the customers commented that rust was appearing in that area. on speaking with land rover they told me that when alloy and steel are mixed,i,e like the hinge and door a electrical force traveling between the two causes the furriness as you describe. your deck will be a mixture of both products and the one way you can stop it is to isolate all contact points on the joining process. its just one of lifes irritating problems.