After 5 years of happy touring in our Swift Sundance, my wife and I have decided to redecorate the interior of our moho. All seems to be going well apart from the reupholstering if the lounge seating. Some of the back rests have 8mm plywood backing, which is very difficult to fire staples into. I've tried hand held and electric staple guns with both 8mm and 6mm staples, which both fail to fully insert the staple. I've tried tapping in staples with a hammer but all that happens is they seem to buckle rather than go in further. I've looked at hiring air staplers but they seem v expensive for less than a day's work (stapler £40, air hose £13 and air compressor £93). Has anybody got any alternative/workaround ideas?