Jim, I really really reviewed spray on chrome systems, the problems are (the clear coat) can really yellow after time, and the other huge negative is that they are a paint, not a plating so they can scratch, chip and every other negative that paint has, which becomes a issue on suspensions parts. When you are scrubbing off the bugs or a rock hits it it will be the same as hitting paint, fixing the chips would be a issue also.
I think powder coating would be much more durable in the long run, and they get pretty close to chrome especially if you go with their polished ceramic, there are many that advertise in the back of the NSRA magazine and I have seen this companies in person and thought it looked good and durable https://www.facebook.com/pages/Perfo...48473151862620 and was very reasonable. I had a friend do his whole corvettes suspension and it looked nice, more like polished aluminum but lasted til he sold the car. Heck I even checked into doing my own nickle plating.
After carefully considering the alternatives along with maintenance I fell for a chrome axle (yes $$) and fabricating my hairpins out of 304 stainless and polishing them as my frame is stretched and I needed custom lengths anyway, there is a reason that manufacturers are paying the crazy price for having their parts chrome plated (Advance plating is one of the best) or fabricating out of stainless, sadly the look comes with a steep price. I was buying a Heidts superide II years ago and called a chrome shop about plating the a arms, trying to save money instead of buying their stainless option, he told me, "You can buy these in stainless and your calling me to plate them?" From that moment on I realized the value in stainless, looks close to chrome and its repairable. Just my findings anyway, good luck