Used RAF BID glass and SafetyPoxy. Used wet flox to fill in honeycomb edges and create a fillet, then layed up 2 plys of glass tape. Cleco'd louver onto flanges so the flange faces will conform exactly to louvers.
2 Ply BID Glass tapes, using RAF Glass and SafetyPoxy
Tapes wetted out
Louver flanges covered in duct tape then cleco'd to wet BID flanges.