Do you need to permanently affix your board to one location without using screws? With this 3M VHB (very high bond) foam double-sided tape you will be able to utilize the multi-purpose acrylic adhesive on both sides of the conformable foam to stick your PCB to any flat surface you need to. Simply peel one side of the foam tape off, affix it to your board, peel off the other side of the tape and stick it to the inside of an enclosure, work bench, project, or pretty much anything else that you see fit.
This tape is 1" wide, about 0.07" thick, and is a little longer than 1 yard (to compensate for extra tape that may be stuck to the inner plastic tube). It should be noted that this tape is extremely difficult to remove, so be sure to know exactly where you want it to go before you commit.