Coating a raw AR-15 lower receiver requires careful preparation and attention to detail to ensure a durable and aesthetic finish. Begin by thoroughly cleaning the receiver to remove any grease, dirt, or debris, using a degreaser and then allowing it to dry completely. Next, lightly sand the surface with a fine-grit sandpaper to improve adhesion. Choose your coating material—popular options include Cerakote, Duracoat, or anodizing for metal receivers. For Cerakote and Duracoat, apply according to the manufacturer's instructions, often involving mixing components, using an airbrush or spray gun, and allowing it to cure for the specified time. Anodizing is a more complex, electrolytic process that's typically outsourced to professionals due to the equipment and chemicals required. Regardless of the method, masking off any areas not to be coated, such as threads or interior surfaces, is crucial to maintain the receiver's functionality. Always work in a well-ventilated area and use appropriate safety gear, such as gloves and a mask. Achieving a professional-looking finish may take practice, so consider experimenting on less critical parts first.

The drying time for PVC cement varies depending on the product and environmental conditions. Typically, it's recommended to wait at least 15 minutes for initial set-up for handling and 2 hours for sufficient bond strength for small diameter pipes (up to 3 inches). For larger pipes, or in cooler and more humid conditions, it's advisable to wait longer, up to 24 hours, for full cure strength. This ensures a secure and leak-free bond. Always check the manufacturer's instructions for specific drying times and recommendations.

Attempting to remove marker ink from cured resin is a delicate process, as resin is a hard, plastic-like material once set. If the goal is to extract marker ink, consider these steps: First, safety is paramount - use gloves and work in a well-ventilated area. Second, one could try using isopropyl alcohol (rubbing alcohol) applied with a cotton swab gently over the inked area; alcohol can sometimes break down the ink without damaging the resin. Another method involves lightly sanding the surface if the ink is superficial, followed by polishing to restore its shine. It's crucial to test these methods on a small, inconspicuous area first to ensure they don't damage the resin. If the ink has penetrated deeply or the resin piece is of significant value or sentiment, consulting a professional conservator might be the best route.