The defense marker is alright. It works if you only have a small area that needs to be marked. I used it outside the door to my apartment patio and worked for a little bit. It's more awkward to put down than a spray and i'm not sure it has the longevity.
Love these - all of my dishes come out pristine. I've used an off brand before and, even with an extra pack, it just didn't clean as well. And the price is really reasonable - I've managed to find sales or coupons usually without much difficulty. Would definitely recommend!