I think it is spelled Zinsser or maybe Zinser? Anyway i saw it in the hardware store and it is an oil base basement sealer guarenteed to hold 35psi water pressure. Smooth finish, portland cement is in it. I am using it on my personal PY Hunter over number 10 canvas. Soaks in and I used about a gallon and a half. It cures in 7 to 10 days. $22.00 per gal. Anyone else ever hear of this stuff? Or tried it? Thanks.