I was trying to be a good son-in-law today and was giving a quick wash and interior to my mother-in-law's Nissan X-Trail. I decided on a whim to put on a coat of M21 since the last wax it got was in early May and was NXT. I put on a thin coat, same as I have on my own car in the past and let it cure for about an hour or so while I gave the interior a quick vacuum and wipedown. I went back to remove the 21 and it was going great all over until I got to a few spots. They felt very rough and the sealant wasn't coming off. By this point it was dark in the driveway and I kept working around. The area under the rear spoiler won't come off and the entire passenger side is now not removing properly. Is this a case that this side is not yet cured? I tried a little squirt of Last Touch on the panel and it made no difference. I'm leaving it for now and waiting to see what it's like in the morning. Has anyone had this happen? Any ideas? I've always had M21 be a pleasure to remove.