Fume duct circumferential joint sealant

A method for constructing a circumferential joint bond for sealingly circumscribing a fume-traversable construction joint connecting opposed ends of polymeric fiberglass fume duct sections, the joint including a seam bounded by an unsanded circumferential outer surface, the method comprising:

• forming an ambient curable and flowable mixture by mixing and blending an admixture of epoxy resin and glycidoxy silane with an admixture of amine hardener and amino silane;
• applying a first layer of said curable mixture to said unsanded circumferential outer surface;
• sequentially wrapping multiple layers of fiberglass mesh about the first layer of curable mixture applied to the circumferential outer surface, and saturating each successive layer with the curable mixture;
• and
• permitting the curable mixture to solidify and harden.

A method for joining a first mating surface of a polymeric fiberglass section to another polymeric fiberglass section having a second mating surface adapted to fit together with and be joined to the first mating surface, in the formation of a construction joint for connecting opposed ends of polymeric fiberglass fume-duct sections, which comprises:

• forming an ambient curable and flowable epoxy adhesive by mixing and blending an admixture of epoxy resin and glycidoxy silane with an admixture of amine hardener and amino silane;
• applying said epoxy adhesive, without sanding, to at least one of said polymeric fiberglass mating surfaces;
• joining said mating surfaces in contact relationship;
• and
• maintaining said contact relationship until said epoxy adhesive cures to a set.