We race weekly on polished wood for the last 8 years and have noticed a very slight amount of impact damage but that's only ever occurred when the carpeted landing area wasn't large enough and cars with bad suspension setups landing heavy on the wood. Even then it's not huge chunks.
Black marks can be left if somebody spills a fizzy drink but it rubs off with your foot. The same as somebody doing doughnuts will leave a little rubber but just like a shoe would leave scuffed off the ground.
The cars effectively clean the racing ling although one word of warning that shock oil from a burst shock then raced on makes for a very very slippery floor.
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