If you have read my thread you would know you can do it with a 33 but not sure I'd recommend it. Myself if I was to do it again I would get my idea of my end results on paper. And hire or rent the bigger equipment. I spent many hours (150ish maybe) it can be done. It oh my you can get so much more done and faster with the right equipment. I didnt get near as deep on my shallow side as I would have liked. It did seal pretty good I will say. Prolly more to do with good ol kansas clay. But I was stubborn and said I can do it with wht I got and I did 90% of it.