There are two types of leaks: Valve leaks and seal leaks.
If gas is coming out the barrel, that is a valve leak and a lot harder to fix.
If gas is coming out the seal around the tip of the cartridge, that is a seal leak.
This is how to fix seal leaks.
Step 1: Materials
- The leaky gun in question
- Full cartridge
- Teflon plumbers tape, available at any hardware store that is worth shopping at.
- Silicone spray lubricant or Paintball marker oil. Do not use any other type of oil, it will freeze and damage the seal even more.
Step 2: Oil the seal
Anyway, put a good amount of lubricant on the seal. you should do this after every game before you put the gun away, and, if at all possible, each time you load a new cartridge. Basically, the more often the seal is lubricated, the better.
Step 3: Tape the cartridge
Then, put some more lubricant on the taped head.
Refer to the pictures.
Yes, you can prepare multiple of these before you play a game, just make sure that the tape isn't unwrapped.
Step 4: Load and test
Remember, lubricating your seals is a good habit to get into!