Did a little test last night. Took an old polytarp I had (the blue kind) and used my contact cement to glue black plastic on one side. I held it up to the shop light and it blocked out pretty well. I think it's the cheaper solution to my problem.

I think I have also found a good source for green, brown or black polytarps. they don't fit the exact size I will need but they're pretty close and at least the outside of the canopies won't be bright blue.

Now I just have to find the industrial size for contact cement. I figure with the two canopies I have about 1,580 square feet of black plastic to glue down. If everything in my future posts is all mexid up you'll konw I dno't hav enuogh vnetiltaion!

Thanks for all the comments and help!

__________________
"One of these days...I'm going to cut you into little pieces"
Pink Floyd