Let me start with the fact that I'm a retired welder that has replaced 1,000s of floor pans over the last 28 years.

Bonding floor pans can be done if you are replacing individual pans as long as you don't need to replace the body structure that the pans are attached to. If its just the floor pans, it may even have an advantage bonding the pans in because the process seals the pan to the metal they are bonded to which likely will prevent future rust forming at the seam.

There is at least one disadvantage to bonding in a floor pan, the bonded area is an overlap. The new pan has to over lap the original pan by about a 1/2" all the way around the old pan, and that seam will be visible from under the car, if that is something that would concern you. Bonded panels are not butt welds that so many here are concerned about. A properly done bonded pan would have to have all of any paint or surface protection removed from both bonding surfaces all around the pan. Properly done, the bond is suppose to be as strong as any weld.

If body structure that supports the floor pan needs to be replaced, that replacement floor support needs to be welded into place, then the pan can be bonded to the welded in support.

It is not recommended for a full replacement floor pan assembly to be bonded to the body without several welds.The stress forces of the body to floor pan that is only bonded in place without welds, can cause the bond to fail. Unless the information has changed recently, a panel under stress was not intended to be bonded in place without additional welding support. Gene