I just covered an Aeromaster using metalic red, metalic green and metalic gold as well as white. The red and green were no problem at all, but the gold was a bear. It does not seem to like to shrink. Fortunately it does not melt through easily either, even with the heat gun on high about a quarter inch away!

I have used Monocote for many years and found each color to behave differently. White and other opaques shrink easily. Some of the metalics (blue) do too. Some are more trouble.