Bunding is wonderful!
It makes a very grotty job just grotty. My recent spill had no bund and was a water leak,
A 50l drum of hot prep ready to pump into the lister tank was minding its own business and a cooling pipe on the lister leaked. Fortunately all the water was caught in the 50l drum, unfortunately all the oil came out over the engine shed floor and down the path. Waited for it to set and picked it up with a spade,
Dick