After about 80 hours the surface still felt a bit sticky (no further improvement during the last hours). Therefore I hang it outside. I think there it must completely dry within a few hours even in the shadow. I made already a water test. As far as I can see it is 100% waterproof. No need to repeat the treatment. The character of the fabric changed completely. The fabric is evenly much darker (a nice brown-olive) and water drips off fast. Before the treatment the ripstop nylon soak up any wetness and got promptly spotty (This was the reason why I did not want to use this fabric for my hammock project). Tomorrow I will put it on the scale. Before the treatment the 12' hex tarp was 10.4 oz.