Until I get my garage. All of my car work happens on half gravel/dirt or dirt. I was spreading out cardboard every time I worked. It was better than dirt, but not great.
When I rebuilt my back porch I decided not to splice the 12' lengths of vinyl soffett for my 7' wide porch ceiling so I had about a dozen 5' pieces left over.
While working on the MT trans swap on our new Baja, I was spending alot of time on the ground underneath and started using the soffett scraps to lay on. You can attach them together to make it as wide as you want. Sliding on the is easy both for you and heavy chunks of metal like trannies and rear diffs. They have grooves, so dropped tools and bolts don't roll too far. It's vinyl so the puddles/mud don't soak up through like they do with cardboard.






