Wayne Parham Messages: 18787 Registered: January 2001
Illuminati (33rd Degree)
Remove the vapor barrier (paper backing) if there is one. Then cut to size. Run a bead of white glue all along the sufrace to cover. Just lay it down in a line back and forth until you've covered the surface with lines spaced a couple inches apart. Press in the mat of insulation and you're done with that side. Repeat for all surfaces (back, top and side nearest the port). Then cut one that fits the cross-section (same size as top), run a bead of glue on the cross-brace and install the sheet.
The insulation will make you itchy but you only have to do it once.
As for a spray adhesive to capture/contain fibers, I don't advise it. The insulation doesn't shed fibers by any appreciable amount once it's in place. The only exception is cases where you want to hide the insulation in an open port, painting it black, for example. But if this is done use the absolute minimum amount. The fibers need to be free to move and they can't absorb energy if they're all stuck together.