Step 5: Lightly torch plastic cutouts
NOTE: I'm sure the fumes from this step are very bad for you to breath, so do this step outside where there is plenty of ventilation. Do not breath the fumes!
Turn your torch to its lowest setting and practice on a piece of scrap material!
Wearing gloves and safety glasses, you want to bring your cut edge close to the flame and let it warm up so it quickly acquires a glossy finish. The material should NOT melt to the point where your piece is malformed or anything drips from the heat. In fact, the flame should not touch your piece, just the heat from the flame. You can see in a picture below that the flame should be pointed parallel to the piece that is being heated.
When you heat your piece, any loose material should be burned away and any surface that is white from the saw blade should regain its original color (red for me) and also get a gloss finish.