Step 3: Paint Hour Markers
1. The easiest way is to place a mark every 30 degrees from the center. This will give you your hours markers.
2. The second requires some math. First find the inside circumference of your rim. To do this take the diameter of the inside of the rim and multiply it by pi(3.1415....). Now take that number and divide it by 12. This final number is the distance between each hour when you following the curve of the rim.
If you get lucky and find a rim with only 12 equally spaced spokes all the work is done for you.
After you have found your hour markers you need to mask off everything else. I used a piece of skinny electric tape to give me the width of the hour mark. I felt there was no need to mask off the center of the rim.
Using the color of spray paint you picked, I used Regal Red, Spray every hour mark in a well ventilated area. Place 2-3 coats going light on each coat. Give the paint plenty of time to cure before removing the masking tape.
I decided not to place any numbers on the clock to keep the rim clean and simple. If you do want numbers a simple sticker would do.