I think there a couple of possibilities. The quality control with these guns may be such that one may work great and the next one not so much. Also, it may be very possible that I have just not used mine enough to become proficient with it. I paid 226 dollars for the last gallon of Deltron not counting reducer or hardener. There is no way I am going to use my paint to figure out which is the case.
Please, don't think I am doubting that there are a lot of guys on here who do well with them. My reason for posting was to tell you I was successfully in rubbing the paint out and ended up with a very good finish. Everyone will have make their own decision as to whether they want to go with the HF purple gun.