Put a bit of liquid lube like mineral oil around the threads of the tank and air it up. If it keeps leaking, lube the o-rings and fittings in the air line directly and air it up again.
If it keeps leaking, try a bit of soap and water in a spray bottle and find where the bubbles are. Solve the problem.
CSU Rams Paintball
Rocking drop-forwards like they're going out of style...oh, wait...
Proud Pumper since 2011