Originally Posted by Marshall Welch

"3M Super Trim Adhesive", "#08090". The can is probably 10 years or more older. I also fabricated about 6-8 retaining screws using nylon screws and nylon capped nuts; speed nuts, and 4-6 inch long strips of galvanized steel (sheet metal), which were slid into the holes in the steel reinforcements running along the inside of the hood. I punched corresponding holes in the sound deadener material.

The adhesive is starting to come apart along the outer edges, and in the center, but not yet to a degree to warrant removal of the material and re-applying adhesive. If I recall correctly, I used about 1-1/2 or more spray cans of the adhesive. After I installed the insulation, I compressed it by first laying a sheet of corrugated cardboard over the engine, then putting lots of wads of crumpled paper all over on top of that, and then closing the hood for several hours or longer; overnight probably wouldn't be a bad idea. I might have done it for overnight, but haven't looked back at any service records I might have recorded. I would do the same thing in the future if I needed to do it again.

I recommend getting two cans of the stuff- I would apply copious amounts -- follow the instructions. It's not cheap, but neither is your time to re-do the job. I hope this helps.

Edit: I also used fender washers on each of the retaining screws, to help distribute the weight of the insulation sheet. I believe that the fender washers are stainless steel- they were significantly thinner and lighter weight than any galvanized steel washers I had access to at the time. Either would probably work, though.

Edit2: Regarding the 3M Super Trim Adhesive- the can I still have says: "Net wt 19 oz (539g)".