This almost had to be. I'm sure you were expecting something minor like this. The good news is, its on the bottom, easy coating! Its a shame you can't get another color liquid rubber, lay that down and then paint the black back over it to give you some contrast. I think I read somewhere in post number twobajillionandthirty that you said it was fairly easy to tell where the fresh paint was.
It might be worth modifying your ladder too, attach the feet to 2x4's and glue some pond liner to the 2x4's to distribute weight, especially if you're leaning out over the small 'front' feet when you crawl in and out.