Originally Posted by
SteelCan
^^Excellent story/info however poor comparison.
Reason (IMO) The Last Supper could be the greatest "experiment" (mistake) ever. Other than the Sistine Chapel, possibly the most "valuable" (from many perspectives) painting (fresco) in the world.
Sidenote: How much better would it have been with a better medium? Your comment induced curiosity and a quick wiki read, informed me that "Due to the methods used, and a variety of environmental factors, as well as intentional damage, very little of the original painting remains today, despite numerous restoration attempts, the last being completed in 1999."
The intended analogy and "takeaway" for the OP were that one shouldn't experiment on valuable stuff. If he tried his original castor-oil-and-glue recipe on, let's say, a rare old Italian race bike, it might easily result in total loss of a hub or BB. If he tried it on a clunker, no great loss.