I had similar results as Jamas, using first the roller, then a foam brush, and then the Preval sprayer. What a mess. What worked for me finally, getting a nice even coat and getting rid of the streaks, was to take the remaining dye, diluted at about 2 parts dye to 1 part spirits on a plain old shop rag (i.e. well worn and many times washed t-shirt) and just lightly wiped it over the whole shebang after it had had two days in the sun to dry. This filled in the streaks (and they were really ugly) pretty much flawlessly. It just took time. I did the pure black dye myself, and I think it looks like new.