If you are doing a LOT of stapling, an air-powered stapler (and an air compressor) is nice to have. I tend to use Bostich products because they are reliable, sturdy, and bright yellow so I can find them...
If it's just a few things that need staples, a hand-operated Arrow T-50 and a supply of their staples in appropriate length is a good, reliable one. Staple length should be figured to go through the fabric and firmly into the backing material, but not through it.
As always, personal protective gear, especially eye protection, and being careful where you put your hands to hold things while you staple them is very important. Please don't ask how I know this...
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.