Like most gunnies, when it comes to paper targets I have been using the old standbys of staples and tape -- usually staples -- to hold the targets to the cardboard or plywood backing.
Unfortunately, I do all of my shooting outdoors, and if the least little breeze gets between the paper target and the backing, it tears the paper off of a staple or two and you wind up with half of your target flapping merrily over the other half.
Plus, the plywood I usually use for backing gets shot to hell (pun intended) and there towards the end of the useful life of the backing -- cheap bugger that I am -- it can be a wee bit difficult to find enough intact backing to put a staple through.
Masking tape has all of the faults of staples, and a few of its own.
Namely, it doesn't stick real well in dusty conditions -- I'm in North Texas. We know all about dusty conditions.
I was giving the department Rangemaster a bit of a helping paw at Qualification, when he tossed me a can of 3M #77 Spray-On Adhesive and a stack of fresh targets.
Folks, this stuff is Freyja's own gift to gunny folk.
Three or four quick spritzes across the front of the used target -- still attached to the backing -- and you slap the new target up over the old one, smooth it, and move on out.
No muss, no fuss, and no blowing targets.
The 3M stuff is a bit costly at ten dollars or so a can, but you can find it on special at various hardware stores, and Duro makes something just as good for somewhat less.
Is it worth it? Oh, hell, yes. There's two cans of it in my range bag as we speak.