Locate small puncture and mark with ball point pen. Roll up pad and close the valve. Repair Kit adhesive or other urethane based adhesive to the puncture hole. See local dealer, call first to check stock. Allow 24 hours to dry, if you can.
Easy way is to roll up pad and close the valve.
If you have a more difficult repair such as major camp fire damage, animal chewed on valve corner or any other damage that you do not feel comfortable with attempting your own repair, Cascade Designs has a Repair Program. Please do not forget to include your complete shipping address and a day time phone number. Mostly I used Coleman fuel and propane. Since these are the primary fuels used in North America, I will only discus them. Coleman fuel, isn't just white gas, it's got several additives.