1. Leave your new parts uncleaned in the plastic shipping bag until you are ready to use them. "Fine Detail" acrylic plastic parts come to you protected by a very thin layer of oil. Once the oil has been removed, "Fine Detail" acrylic plastic may be sensitive to prolonged oxygen exposure. Before painting, clean your new parts with a mild water-based detergent like "Dawn", "Fairy", or "Simple Green" in water. Let your parts soak for a few hours to remove any wax.
2. Place your "Fine Detail" acrylic plastic parts in direct sunlight or under an ultra-violet light (UV) lamp or fluorescent lamp for an hour or so (more is better) to fully chemically harden the plastic.
3. If necessary, smooth "Fine Detail" acrylic plastic surfaces with an "air eraser" (click here to see one example). Use common household baking soda as the grit. Smooth "Versatile Plastic", a kind of nylon, with thin layers of primer meant for nylon.
4. Paint your parts soon after cleaning. Use the correct primer, paint and paint thinner for the type of plastic your part is printed in. Thinners containing acetone, acetate or methyl ethyl ketone (MEK) can damage "Fine Detail" acrylic plastic. If your new models are printed in "Versatile Plastic" a type of nylon, choose primer and piant intended specfically for nylon.