There are a few ways to "dip" your arrows.

The easiest way is to use the stick on crestings available anywhere.

Next you can actually dip them. You would need the paint, thinner, and a dipping tube. You will also need plugs to go into the ends of the arrows to keep paint out. Mix the thinner and paint and pour intothe dipping tube. Dip the arrow and let dry. Do this three times to get good coverage.

Third and cheapest is white spray paint. This sounds stupid but it actually works very well. Simply tape off the arrow where you want the white to stop. Apply light even coats to the shaft and let dry. I spray, rotate 1/4 turn, and repeat three more times holding the can about 10 - 12 inches from the shaft. Let dry for about 20 minutes and then repeat. I apply three light coats to get good coverage. After it has dried for a day take some "0000" steel wool and lightly rub the paint to smooth it out.

AS far as how much weight it adds I have never compared before and after so I can't say for sure. I will say that it isn't enough to change point of impact to 50 or 60 yards.

And as far as white arrows in the woods goes you are fooling yourself if you think a deer can see a white arrow sitting on a bow. There are white colored sticks and other things laying everywhere in the woods. And if you are in a tree stand then you got it backwards cause the white arrow will blend in far better with the light blue of the sky and white clouds than you sitting there in the latest Mossy Oak Break Up.

I just spray painted some arrows I just bought. The white is 13.25 inches long from the nock to where it stops. I'll post pics after I get them fletched with white feathers.