Hi Norbert, yes that could be a cause. Or maybe the paint was drying quickly and didn't have the time to flatten properly. Are they completely hardened? I think you should give a couple of coats again, than carefully sand and polish...
I am not using Tamiya clear acrylic anymore because most of the time it stayed sticky or gummy forever. I started using the new Future a couple of years ago, works great every time and can be sanded.
23. March, 08:12