Installing under hood pad
 

I'm in the process of replacing my under hood pad since mine deteriorated on my SL500. I was wondering if anybody had a good way to remove the old foam? I managed to remove most of it but the old glue is still holding on to the old foam. I've tried scraping it but the glue is really strong. Is there a way I can remove the glue with chemicals? Also what spray adhesives should I use? Thanks.

Don't knock yerself out
 

Don't knock yourself out with every bit of foam; you're going to recover it anyways.

What you want to do, is to get the heavy stuff off. You're going to have plenty of spaces where there was no glue on the underside of the hood, so you can apply your new 3M yellow or other stuff (there's a good generic at AutoZone, bigger tube for less, too), I had the toothpaste kind of stuff, smear it on, put your new pad in place, and that's it.

Bottom line, don't worry about scraping the old stuff off. Get the heavy stuff off, and recover.

jeff 1991 300d, 100k

Thanks Jeff...I don't think I can get the old glue/foam off if I wanted to :D. Like you said I'll just remove the heavy/loose foam. Thanks again for the advice.

I use a pressure washer and 3M general purpose adhesive remover. I've done this many times and it works great.

You cover the engine compartment and the rest of the front end of vehicle with plastic. I also drap the windshield and part of the top of the vehicle with plastic to. Use medium adhesion tape to hold plastic sheeting so you don't damage vehicle's finish.

Use only 3M super trim adhesive to apply new pad, part#08090.

what jeff said.
 

I would wash it with some kind of solvent after scraping, just to make sure whatever adhesive you use is not sticking to something that ain't sticking to your hood, if you get my drift. Scrape, then use a rag with your favorite volatile to get any last bits un-stuck.

jeff is right, the old glue won't get in the way.

I like to use 3-m (super) trim adhesive spray, and also 2-tubes of yellow weather strip adhesive.

Before fitting the hood pad back on the car, I like to do a dry fit to see where the new pad will lie and get a visual in my head.
Then I spray the super trim adhesive all over the hood pad, then squeeze 2-tubed of that yellow weatherstrip adhesive(advanced auto parts), on the hood pad in a squiggly fashion all over.

I let the glue get tacky for about a minute or two, then, with the help of an assistant, place the pad on lightly and line everything up, then press the pad on and firmly push the pad with my hand in a wiping fashion to get the pad to stick in every possible spot.

It is a good idea to make sure the hood is straight up, in position 2 so the pad has a lesser chance of sagging.

Keep the hood up for at least an hour before driving off.
That should give the glue time to set up.

Also, before I attempt to scrape the old pad material off, I lay a large sheet of plastic over the engine compartment and fenders to keep the debris off the engine, and it makes clean-up very simple.

I did this on both our cars. My method was to do one side first and then the other side, rather than all at once. Cover everything with a sheet because the spray contact cement will sneak in everywhere.

Thanks for all your replies. I'm hoping to do this as soon as I get a can of the 3M Super Trim Adhesive :)!