The spray is nearly invisible, things get a slight gray sheen but you pretty much have to look for it to notice it. Now, I only used it on red, black, gray and yellow surfaces, so I can't guarantee what it looks like on something white (there is white lettering on part of the harness, but it's plastic so I'm not sure it's comparable to a white jacket for example). But on the things you see below, you mostly can't tell it's there. So I took a photo using flash, since I couldn't tell if the spray was working at all. Judge for yourselves:
|Dog's black jacket (with a white reflector band), red shoes with gray details, black and yellow harness (with a white reflector strip), and black leather leash.|
Well, I'm impressed! My plan after seeing the photo was to spray my jacket, gloves and hat, and all the dog equipment - to start with! However, I am who I am, and lost the spray bottle along the way up here... It's on the list of what I'm buying again, though, and I'm recommending it to everyone! They also had a spray for textiles and fur(!), designed to be washed (or brushed?) away when you get back home, but I preferred the permanent version - I won't spray Monster with it though!
(But it doesn't hurt to wear regular reflectors too!)