From my side and opinion from using it in partial areas of our race shop and always temporarily at outdoor race events on grass, dirt and concrete/asphalt pit areas it fine for as said "temporary" use. If you really use it as a work floor and not just a parking area then any fluids that spill or leak from the vehicle or working on things will seep through the joining points and stay under the flooring for a long time. It's not a pretty site when you finally lift it from the fluids to even the dirt and dust that ends up under it over time. We would remove or lift portions or large section every so often to clean under it. With the outdoor race use it was always rolled up and put back in the semis and then pressure washed after almost every event. Great looking and great as a nice looking temporary floor but IMO not as good as something like a good epoxy or similar coated and sealed floor. I've used it as a temporary work area outside on a section of gravel driveway area so I could use a floor jack and creeper but if you leave it too long the grass will grow up through it and make it a little of a pain to pull back up and apart But at least if you drop a nut or a bolt it's easier to find instead of searching through the gravel Just my

Mike