That’s very simple. RED gives you an ability to nest a filter within an individual layer (or Shape Track, using RED lingo). Simply drag and drop your filter over the shape track that you want to correct. Also notice that within the Shape track a filter can occupy two different nested positions: one nested under the Face – we call it upstream filter – and one nested above Face – a downstream position. I’m guessing that for your purpose the nesting position would not matter but feel free to experiment. Hope this helps.
Boris Yamnitsky
BorisFX