I'm having trouble connecting ModelFlex to weathering applications. It's more of a paint film than anything, and generally needs to go on wet to form that film and shrink to the model. It's semi-gloss to gloss when applied this way.
Weathering is more of a thin it down and mist it on kinda thing. and flat paint helps. I can't imagine using ModelFlex that way, but if someone figures it out, please share the recipe!