Car Heat Sound Deadening Insulation Mat, - 394 Mil 10.8 Sqft Automobile Sound Deadening & Heat Insulation Material for Auto Hood Engine Roof Door and Trunk,40 Inch x 40 Inch, Aluminum Foil Finish

Originally I tried to measure and get the perfect sized mat for my hood, but I ignored the fact that you can cut this with just normal scissors. It's not fiberglass. It's perfectly good quality. In ended up cutting it into squares anyway just to be a little easier to apply. I'm sure you could un-stick it if you needed, but it's not intended to be stuck and unstuck multiple times. This might not work with all cars, but I was able to put this under the factor hood deadener. I just had to poke holes for the clips and push to get them to click in. This wasn't an issue for me, but it shows the product being rolled. Mine actually came folded up. The creases aren't a big deal, but I suppose it might be a problem for some folks. Honestly, it's a perfectly good mat. Plus, it's rated for high heat so I don't have to worry about it melting like butyl.

Worked well for under hood insulation. I used plastic rivets to hold it in place and aluminum tape to seal any place that i had to use more than one section.

I needed to replace the failing fiberglass insulation that was original in my 1996 motorhome. The original insulation was providing some sound/heat protection inside of my generator cabinet but it was falling apart. After cleaning off the failing insulation and adhesive, this new insulation seemed to stick well to the interior cabinet walls. I could easily cut this insulation with my scissors but it does make the backing paper try to shred at the cut edges instead of peeling off in one motion. Just being careful I could ensure that all of the protection paper came off to allow full adhesion to the metal walls. It was fairly easy to attach and turn corners. NOTE: this item could probably be stretched to the advertised 40" x 40" but I wanted to install it in its relaxed size of 38" x 38". I had plenty to cover the inside of generator cabinet fully. It did reduce the noise some from my generator. I guess I could also install more of this insulation on the outer walls of the generator quieting down even more of the noise inside my motorhome. So far it is sticking well but if things change I will edit my review of this product.

Generous amount of insulation with thick foil cover. Adhesive on back side not very strong.

Yes it’s smaller than 40” however, it worked for our application. We purchased 2 It was not on rolls as shown on first picture. It is folded like a blanket. We purchased the thicker padding. The adhesive is strong. Easy to cut. We have not tested it for sound proofing or heat yet. I’m sure it will make a big difference. In our 49 truck.

Used this to quiet an old outboard motor that was too loud due to the original soundproofing being pretty much gone after many years (even the dealer can't figure out the year of this old motor). Worked great. I haven't measured the exact drop in the decible level, but it's noticeable. Easy to install with the self adhesive backing. Made a template using a paper bag, though I think cardboard would have been easier. Got it close, then dialed in the fit with a pair of utility scissors, laid it out and cut the soundproofing using the template. Double checked the fit before peeling off the adhesive cover and installing.

Description is incorrect. Size is 37" x 37". I purchased one of these based ont he 40"x40" size specification but its actually only 37" square and I need more.

I used it to wrap my two H4 batteries on the bottom, top and sides since it cold and the car is parked outside. Cuts easier with heavy scissors and self adhesive .