Depends what you are using a plaster for. If it's just to staunch the blood until a scab forms then I suppose anything will do. I'm a big believer in moist wound healing, and have plasters to this effect (hydrocolloid dressings). Then again, the nastiest owies I get tend to be what moist wound healing deals with - bits of missing skin. Burns and grazes are my usual injuries.
Okay, my burn plaster didn't do too well with the last one, but I took it off far too soon. The only icky thing about having a wet healing plaster on a graze is being able to see the open wound underneath (they are mostly transparent). Still, it's good for sympathy/ grossing people out
Question is, Flint - would you duct tape a bit of material to your kid's leg if they took the skin off their kneecap while running? I'd like to hope not. Some dressings help prevent scars after all.