Used it for quite a few things, fixed my favourite fly swat, repaired my phone case, made a lip on a drain pipe, made nocking points on a bow string. Had one failed repair on a pair of boots, I put it down to being a porous surface, Im sure they say it works for non porous only and it does dry quite hard. For this reason I have my doubts about your intended repair of an air mattress; get a quick mattress repair kit and save yourself some time. Unless of course you are experimenting, if so have fun and think of a few jobs to do with it at once or you always seem to end up with a blob in your fingers and a "what can I use this for" question in your head.