Waxoil....on a warm day .....sorted
Many years ago I decided to Waxoyl my MGB GT. I wasn't sure how much to use, and assumed that more had to be better than less. After I finished I left it parked on a grassy bit of our driveway, on a hot day.
Needless to say the excess Waxoyl dripped out of all the nooks and crannies and did a fine job of killing the grass, leaving an MGB-shaped image burnt into the grass. 'Er Indoors was not best pleased.