Applying the spray is perfectly okay - that with something rather should work outside and on unempflichen surfaces quiet may be dirty sometimes, in my opinion, ought to be taken for knowledge - Spray is welcome to the peculiarity to over the air distribute and after all, the tool is supposed to hold good.
Unfortunately, I'm quite disappointed with just this point - the durability. Only my shoes were after intensive spray treatment still beautiful and deep black. I have a spray applied as directed and allow to dry well long. The beautiful result held only a few days. After 1 week, they were again rather anthracite and gray again after 2 weeks - even in places that similar not large by friction be worn. I am also not gone so through puddles or pouring rain, what this would possibly be able to explain.
Of course, on the packaging that the repeated application of results in better durability, but to be honest, I did not expect that the shoes look after 2 weeks again, as before ... and the shoes entirely the need for spray every 2 weeks is me in the long run a bit too expensive and above all too expensive ... which I can already buy again permanently new shoes ...
I also realize that the life also depends on the material to which the spray is applied. I however do not own other black suede / velor items, I can not test on other substances / fabric qualities there.
I would recommend this product to my personal experience, would not recommend and would not buy it safe again. Thus the search for me starts again.