Why I don't much care for Tamiya acrylics. Happens more than any other paint.
When I use it I start with their rattle can primer, which I use on all models anyways because it's really thin.
The challenge here is going to be how you mask around the damage to repair it.
I'd get the 3m tape that has the orange core and desticky it a bunch. Or use post-its, and mask nice and square because it will probably show, but may come off as plating. Also, your boot stripe is a little tall, no?