There has been a thread on this recently, with as many different answers as there were responses. I recently installed my carpet and my research into some of the Ford Documentation showed that there are double sided tapes beside the sill plates. There are also 6 screws used to hold the carpet in place. Instead of the double sided tape, I used Spray Adhesive on the verticle surfaces only to keep the carpet in place while the new carpet found its new home. I also let the carpet lay in the car for 3 weeks to get the wrinkles out.
I certainly wouldn't use asphalt adhesive again. It does sound like a mess, but I can't recommend anything other than what you're doing.

 

The two large pieces are laid in. No glue.

 

Correct- oem's do not use (and have never used) asphault ahensives for any inerior applications- when heated, it re-liquidfies producing ingitable vapors.in essence it reverts to its original forms....petroleum...and that is a no brainer...petroluem product plus heat equals intense fire.

 

I have installed carpet in many mustangs and fords. I have done the install in just about a hour never had to let sit in car for any amount of days and never used any type of spray adhesive. I have always placed carpet into place and started with inside seat belt bolts and then shifter plate. then work my way to sill plates and kick panels. No trick to it just make sure to trim slowly small sections at a time. Much easier to trim twice than to trim off too much.

 

Thanks for the help

 

If you have purchased the right carpet, it should be molded and lay nicely in the car with the kick panels, door sill plates and seats holding it down.

Good luck