I suck at using this stuff. I was using it around a window air conditioner to get it sealed back up and I managed to clog the plastic attachment that goes onto the nozzle and focuses the spray of the foam. Supposedly you just rinse it off, but somehow, it was beyond that point. There's still plenty of liquid in the can, but I guess I'll just have to wing it if I need to use it again. The can is actually quite tall, and you get a lot for the money. Just be careful with that plastic attachment thingie, because the tall can ain't worth much if you can't make use of it. Having said that, a more experienced person may have better results than me.