I agree that the Metalflake brand was the best clear on the market at the time. The Dupont always seemed a little cloudy and yellow. The issue with laquer is that it has no elasticity. Metal expands, and contracts with temperature. Laquer does not move with it. That's why you get all the cracks. Bike tanks usually didn't last long at all. 55 degree gas in a tank that's been in the sun on a hot July day is pretty hard on the paint.
Mr. Cumby, remind me to check on that 99L if I forget. We might be able to find you some.