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If you are recharging your system, ignore all the gimmicks. If you're A/C system is low on refrigerant but is still blowing cold (say 38-degrees), you will never get a 20-percent improvement over that (or 30.4 degrees out of the vents). Also, much like stops-leak for tires, the leak-stopping solutions are designed to gel up once they hit air and can destroy your compressor, clog the desiccant pack, and clog tubes in the system. Stay away from the gimmicks and use regular old R-134A.