So i finished my first HDU sign for a winery in my area. it was really easy working with this material, it cut like butter. there wasn't much clean up that had to be done on the final piece. i need to get better at painting, right now i am doing it by hand, but would like to get a sprayer at some point.
When you do get a spray gun, get something with a large orifice - a 2.3mm tip is what I use for gelcoats and HDU primer. I tend to stick with the cheap ones since my cleaning practices eventually do the gun in (particularly with gelcoats which are really hard to clean). www.northerntool.com/shop/tools/product_200319459_200319459
I'm sure Harbor Freight has something similar and I wouldn't hesitate to go that route too...particularly if it's just for shooting primer.