You forgot one VERY IMPORTANT TEST. While many paints are "Raw Fuel Proof", you need to also put the test panel in the exhaust stream of a running engine (about 12" - 14" from the muffler on a 40 size engine ) for about 8 - 10 minutes. Then let it sit for 45 minutes - 1 hour before wiping it down. I found this out the hard way with some clear coats I tested. While the majority of ACRYLIC clear coat enamels were raw fuel proof, not all of them passed the exhaust test also.