Can I use Rustolem glitter interior wall paint exteriorly?

So what might occur if I use the Rustolem glitter interior wall paint on an exterior application? One use would be on a latex painted back door, and another on a metallic trellis. Will it just not hold up well in the sun and elements? Will it wash away without a clear coat? Or will it all be glittery and fabulous despite the "interior" label?