Neither. You cant "reseal" them externally and expect it to last
Change them out.Use the correct tool to install and use some Green locktite on the perimeter of each hole /plug
The locktite is an anaerobic sealer and will harden once installed. It will seal the plugs imperfections and also hold it in place so extreme pressure wont blow it out.
Also , they are not "frost " plugs.
Technically they are "welch" plugs....
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