I would of thought so if heat does not effect the sealer and the sealer is not going to melt plastic

Do that while the case has nothing in it and make sure it's dry before you put it back together

You can also use hair spray and old artist trick same thing though use that while the case has nothing in it, be careful you don't go over board though hair spray can melt plastic if it is soaked you only need a couple of light coats

The joys of hair spray is you can pick your finish I will let you figure that out, most are just glossy though