I had that problem with 18RG, but never with new half moons. When I put the new half moons on a 22RE, it sealed fine with some sealant. Check for any nicks, deep scratches, or dents in the head casting around where the half moon goes, and sand them smooth. Otherwise, be reasonably liberal with the goo, especially on the corners of the half moons, and let it go off (semi set) before torquing. Are you using the silicone based sealant, or the non-silicone stuff?? I find in this particular case, the silicone gives me more success.
Cheers, Owen
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