There are two ways to seal plumbing pipes. The first way is to use Teflon tape. It is easy to install and does not create a mess, but in high-pressure areas, it may leak. Pipe thread compound is the second type of seal that plumbers use. The compound is durable, but it does get messy.
CAUTION: Thread sealants should be selected based on specific application. Thread sealants tapes and or sealant compounds may be required for, or not suitable for, certain gases. Sealants can improve seal between joints, reduce corrosion and can keep joints tight.
