Rearview mirror adhesive, - use pad or just glue Options

[Sprout]

My rearview mirror fell off, so I bought a Permatex extreme strength liquid adhesive kit. The old mirror base still had some of the old foam pad on it, so I cleaned all that off, as well as the windshield. Before I put it on, I found an old thread on here where someone said to only use the adhesive pad similar to the original, and NOT glue the base directly to the windshield.

Does using the pad really matter that much? Have people glued directly to the glass and not had any problems?

Thanks

[porschetub]

My rearview mirror fell off, so I bought a Permatex extreme strength liquid adhesive kit. The old mirror base still had some of the old foam pad on it, so I cleaned all that off, as well as the windshield. Before I put it on, I found an old thread on here where someone said to only use the adhesive pad similar to the original, and NOT glue the base directly to the windshield.

Does using the pad really matter that much? Have people glued directly to the glass and not had any problems?

Thanks

Ive never had any luck with adhesives on any car,I used a pad from Pelican I seem to remember its a 924/944 part ...not 100% sure now,they are cheap so buy 2.
I marked out the outside of the screen where I could see the old outline from the inside with blue painters tape.
These pads only work if the surfaces are totally clean,I used window cleaner then acetone ,line it up to your reference mark and give it a firm push onto the screen,job done,good luck.