Range Rover Classic rear wings - best alternative to dum dum sealant?

Hi All.
I'm finally getting to the stage of reassembling my 94 Classic after a full rebuild. I bought a roll of butyl tape to use when fixing the rear wings but it's so sticky I think the wing would get badly damaged if it needed removing in future. Any alternative suggestions for a suitable sealant that isn't so sticky? Seems nobody has any dum dum any more. Thanks.

caravan manufacturers use a non setting sealer in a gun type applicator, its stcky but because it doesn.t set,can be pulled apart

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