R10 Plastic/canvas white side curtains.

So preparing area for R10 in garage.  Experiencing distance variation.  I am working through possible interface causes.  One that I wonder about is my side curtains are an old wedding tent white plastic type tarp.  I am curious shine could cause interface?  My logical brain says no, it is Doppler radar not camera.  Yet my reduce all potential problems brain say go buy flat black paint and paint them black.  Obviously leaving white at the end.