I will clearcoat on anything. Oracal vinyls, 3m, it matters not. I have clearcoated over laminated and non laminted prints, i prefer non laminated. I put 2 light coats on it then a heavy third. Ive never had an issue. I lightly scuff prints with soft scotchprint pad and wipe with water
my preference of clear is ppg 2010 clear, high solids