coat cut liner edges before they enter the airstream insulation, liner, vapor barrier & condensation cut duct liner edge coating exposed fiberglass liner edge finish every field-cut liner edge with the approved edge treatment so fibers are secured and the airstream-facing surface remains intact. untreated edges can erode, shed fibers, absorb moisture, and fail inspection. liner manufacturer instructions, project insulation specification, approved product data what approved edge treatment are we using on these field-cut liner edges and penetrations?