I applied the paint over the weekend. The DuraTex paint worked great, it was just what I was looking for. In the can the stuff is about the consistency of licorice pudding. I had originally planned to spray it on with a cheap airless sprayer, but it just sort of clogged the thing up. Instead I rolled it on with a small thick-napped roller. The paint covered nicely, dried fast and has virtually no odor and looks to be pretty tough. The minimum order qty was a gallon. I used less that a quarter of that.
My crossover is not that far off. The 2425s are actually 8ohm rather than 16ohm like I originally posted. The nl200t3 crossover clone that I have needed to be padded down about 3db in the horn, but then the speakers sounded very nice. I still plan a rebuild of the xover in the near future.