I applied Sonax Premium Class about a week ago and a few days later I realized that I missed buffing off a big section of my rear bumper. Needless to say that by now it has fully cured and won't just buff off with a microfiber. So I figure my option is to strip that panel and reapply. But is there any other option that doesn't require me stripping the wax? I can get pics tomorrow if my description didn't make sense.
Let some QD spray dwell on it, then wipe it off gently. If it's really stubborn, spray a MF towel and hold it in place for a while to soften it up.
I do the same method with M105 as well when it clumps in crevices along panels. Just rub some fresh M105 and it seems to come right off. Works Wonders!
APC might be too strong and remove any LSP previously applied. Not sure if vinyl will spot up with the wrong Apc mix.
I say just strip it off with an IPA mixture and re apply. If its just your rear bumper its not a big deal to apply a new coat of protection to it, plus your not going to use much of whatever LSP your using since its just the rear bumper not the entire vehicle.