Ryan, as long as none of the threads are exposed there is no reason to add another coat, at least for technical reasons. I can understand wanting to add another coat if the wraps didn't turn out quite like you wanted, but if they are uneven, lumpy, or swollen on one side or another, adding another coat isn't going to correct the problem. It would be best to strip it and start over.
However, if there is some other reason you want to add another coat, go ahead it won't hurt it and the weight is a non-issue. Just lightly scuff the current epoxy with fine grit sandpaper to ruff the surface. This will make the new finish bond better.
As an aside I exclusively use Threadmaster on all my custom rods. Whether it is a superior finish is up to debate but it certainly is easier to use. (Yes, I think it's superior
)
Feel free to send me an email if you should have questions.
matt
