I let my sister borrow my aerobed mattress and got it back with a slow (very very slow) leak. It takes about 15 mins for it to go down while laying on it. I have the stuff to patch it, but how do you find what might be a pin hole in a full size mattress. I have tried putting my hand over every square inch on top and bottom and can't find the leak. Any one have any ideas before I have to shell out 179.00 for a new one (even though this one is only 8 months old). I think one of her rug rats might have stuck a pin or something in it.