I printed this on Form Labs Form2 in clear resin. I primed the print with a sandable filler primer (grey as you called it), it is a 2 in 1 Primer and you can lightly sand in between each coat. It's great if you're using a FDM printer and have visally print lines. http://amzn.to/2gNRhCN
The Red Paint is Golden Fluid Acrylic Cadmium Red Medium, http://amzn.to/2uDxRq5
The White Paint is Golden Fluid Acrylic Titanium White http://amzn.to/2gNDzQq
You can buy it from Michael's or Amazon.
Hope this helps!