I have not use their insignia masks but i have used the canopy masks. biggest mistake i have made, bloody awful. But as long as the masks are on a flat surface and have no curves, especailly at the edge of the mask, you should be ok.
I do have a set of insignia masks for a 24th Stuka, but after my past experiance, i am in 2 minds about useing it.
I am a Norfolk man and i glory in being so
On the bench: Airfix 1/72nd Harrier GR.3/Fujimi 1/72nd Ju 87D-3