I don't have the Shrockworks specifically, but I just rattle canned the 4xInnovation front bumper with Rustoleum truck bed-liner. Did a good couple of coats of primer and then a few coats of the bed-liner after that.
I've got a rear bumper on the way and I'm considering having this powder-coated with a similar texture as I don't have the room currently to paint it where I'm at.
Here was my process (took about a week to complete):
1. Position bumper on saw-horses
2. Wipe down with acetone
3. Heat bumper with butane touch to "sweat" it
2. Spray light coat of primer
3. Let it dry about 30-45 minutes and repeat step 2 about 3-4 times until a good solid coat of primer has been applied
4. Wait 48 hours to dry before adjusting the position
5. Repeat step 2, 3 and 4
6. Spray bed liner in same steps/manner as primer applied
It's been about 3 years since doing that and there are only a few spots that I've considered retouching. It's been holding up well! The three things to remember before doing it are: preparation, preparation, and preparation