I don't think the problem is just with Lustercoat. The Lustercoat can even states that it will curl canopies, but I think it is because of the solvents which are widely used in the industry.

Despite what the can said, I used it anyway without curling. I primered first with Rustolium (grey) and then shot the lightest coat possible of Lustercoat grey that I could. It seem to work, but the plane is fairly new and only time will tell if the finish will be durable.