In this particular case I don't buy into your explanation of why it did not work.
FOR THE BOTTOM ONLY...I tried every time combination from one hour to 10 hours...and it did not budge the paint to my satisfaction.
TOP ONLY...left on over night covered (just like bottom) every thing was wrinkled and came off very easy.
I never had great expectations for the bottom. However I did not want to use ZIP STRIP on the top paint, so the SOY Strip was excellent for my purpose.