Door Racks are awesome. Is it possible to have something that's perfect? I highly doubt it, however, these are as close as I've ever found--purchased or home built. I've tried my fair share of racks and none have been as effective as these.
My biggest concern was leaving dots. I can say these are minimal and are easily remedied. If I end up with issues, that just means my last coat is done 1 side at a time. I typically spray primer and 1st coat--both sides at the same time. For the final coat, if there are no marks, I continue this. If the doors are heavier or have marks for whatever reason, they get a light scuff and then painted 1 side at a time. That still saved you half the labor on the primer and 1st coat which to me is invaluable.
Just purchased 2 more sets to help with completing multiple jobs at the same time and not having to empty a rack prior to starting the next coat!
Thanks Door Rack Painter! Matthew