Well, Slapper, I see I missed you by a few minutes and you missed another loose end. I do think you are correct on the finger nail polish being recommended--seem to recall reading it in Walbro repair info. I attended an Echo update in the early 90's and the tech then was recommending super glue. I do recall when ethanol came on the scene, I seemed to find a lot of loose, crinkly sealant around the welch plugs and even displaced welch plugs--don't know what the OEM's were using.
Rob, the HD locktite probably is a good choice that I'll have to give a try. On the other hand, it's good to know that I'm not the only "two stroke joke" or are you referring to welch plugs in general.