I have made my own arrows for quite some time . I generally use stains and fade them together , look cool .
But time for something different .
So I am wanting to dip the crowns and my question is , how much do you thin the paint ?
I am planning to use model paint and a two liter pop bottle .

Make one out of PVC. Will use less paint to fill and maintain.

I made mine to accept about a foot of arrow shaft, but you don't have to dip the shaft that deep. I also made the long one for complete dipping. I use 1/2" pipe for the body.

https://www.youtube.com/watch?v=yjK-Mw7EK-Q

I have yet to master the correct thinning ratio. I usually do it too thin. That results in several dips needed.

I use fletch lac thinned to about the consistancy of maple syrup. It usually takes 2 dips but some times takes a 3rd depending on tempurature.

I use the bohning paints and thinner, the instructions on the thinner says the right consistency is when you pull the dipped shaft out and paint runs/drips off and stops between 10-15 seconds.  I usually try to shoot for around 13 mississippis. depending on colors I'm dipping 2-3 coats, and an occasional 4th coat, 2 of them are a white base coat.

With Bohning lacquer, I use two parts lacquer to one part thinner.  That should work for about any lacquer.

Thanks for the input .

I use Stickbenders method. I like at least 3 thin coats sanded or steel wooled between coats. That makes the best finish.