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Flue and dektite sealant for polycarbonate roofing

I have a wood fired pizza oven flue to extend thru polycarbonate roofing I have installed a 6' internal flue with an 8' secondary flue to provide better insulation from heat affecting polycarbonate roofing. Finally I will installed a suitable rubber dektite but now need to know which sealant is the best and will provide adequate sealant roof is a 10 degree single pitched roof.