[dfwright]

If you still have access to where you've put the fatmat in your doors, I'm going to offer you some sage advice. I used fatmat in my doors also -- the exact brand FatMat.

After 9 months to a year, the adhesive failed. I am pretty sure there was a good clean surface in the doors, as I had the bottoms of the doors cut off to replace rusted metal. I cleaned out the inside of the doors, painted them with Eastwood's rust encapsulator and later applied the fatmat.

It may just be that fatmat won't stick to rust encapsulator, I don't know, but I had to go back and use a sealant to re-apply the fatmat inside the door.

I haven't had any issues with the fatmat on the floor of the cab, just the vertical placement in the doors. I would recommend a good 3M adhesive applied to be sure the fatmat stays in place.