Wow, I was beaten to this post !
KUDOS to the use of cardboard, easy and very transformable. EASE of fixing up screw-ups 'cause cost, well..., could have been "five-finger-discounted" !
Best of all cardboard is the moist vegetable cardboard boxes ie: cabbage, carrots, sprouts...
Waxed board , WILL last longer to elements and somewhat stiffer. Probably the greatest for wheel wells at a cheap.
I've used it for frontal air barrier/RAD. blocking and quite durable 👍
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