Pressurizing an aerosol can is not difficult, as you will discover in the video. I would recommend that a person's body weight be more then a 100 lbs. when using the bicycle pump. The WD40 can needs between 90 & 100 PSI (pounds per inch) to pressurize the aerosol can at its maximum. What's so nice about this little trick, when applied, it make use of the full contents of the can, otherwise you're discarding the unused product. I give credit to You Tubes sixtyfiveford (   • Refill flat AEROSOL Spray Cans like t...  ) for the idea, as he used a compressor where as I have used a bicycle pump.