So i made a beach cake wrapped in blue fondant and then went to sprinkle blue dust on top of it not knowing it would stick without water (this is my 2nd cake) and I used a little brush to put a tad water on top and now there are two dark streaks where the blue dust fell. . I realized it didn't need water after that so the rest of the cake is smooth and even and then there are two brush strokes on one side. .. ugh!!

Is there any way to fix this or am I out of luck??

Thanks!

Anyone??