The Flex Addititves are not meant to be a long-term fix..they are supposed to be used on urethane bumpers and peices that will have to be twisted and moved around allot during re-installation after a paint job (like a corvette facia, or the rear bumper covers on some of the newer cars). The Flex Additives evaporate out and leave you with the same clear after a period of time. What you need to do is figure out what you did wrong the first time, and fix it. I've used the Nason clears before, and I haven't had any problems with them chipping, but I don't use them much.....I prefer PPGs 2021 or HOK's clear. If you can find a clear that you like, you COULD sand your existing Nason clear to give it a bite, and put a couple of coats of a more 'pliable' clear over the top to resist chipping..but the Nason clear will still be brittle underneath.