I have found some light weight nylon which is a car cover and is supposed to be water resistant.
It is only $25 and and suits a large a car so I would get a lot of the material.
I have held it up and tried to blow and suck air through it but none would pass through.
Would this material be water proof? if I take it home is there an easy way to test it before I cut it up.
I plan to make a cat cut tarp out of it mostly for summer as I have my neo 9x9 for wet conditions.