I've used POR15. It flows out real nice and cures rock hard but still tough. You will have to use a good brush so the bristles don't pull out. Put LIGHT coats on or it WILL sag. Once. you get it on, don't over work it or it will pull and you will get brush marks. Also, try to creare a humidity and temprature enviroment within the range on the instructions. Buy a gallon of mineral spirits for clean up (mean stuff to get off later) and this can also be used to cut it down (thin it). Remember, don't go on too heavy with it. When done right it looks real nice.
P.S. I would start by going into tight spots first and then let those areas cure off before going back and doing the large areas that you want to make few clean brush strokes on.