There's no hard and fast answer to that, bigcountry. Depends on what kind of paint or lacquer you use, length of the dip, how many coats you do and how thick you make them. It can turn into significant weight. I've seen as little as 10 grains and as much as 45 grains.

I don't fool with dipping and cresting much either. It looks nice and everything, but I don't want any more weight on the tail end of the arrow than I absolutely have to have.