Yes, you can use Teflon tape and liquid thread sealant together on heavy-duty metal pipe threads, and this combination is frequently favored by professional plumbers for maximum leak-proof security. To apply them correctly, you first wrap the male pipe threads with high-density Teflon tape in a clockwise direction, and then brush a thin, even layer of liquid pipe dope directly over the taped threads before screwing the fitting into place. The tape acts as a dry lubricant and initial filler, while the liquid thread sealant fills any remaining deep imperfections and cures to create a robust, vibration-resistant seal that withstands extreme water and gas pressures.
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