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Some products, like DuraCoat, air dry to a set finish. Other products, like DuraBake, need to be baked to set the finish. You can bake small metal parts in a toaster oven. However, if you plan to keep the gun intact or if the parts are too large to fit in the toaster oven, be sure to choose paint that sets while air drying and doesn't need to be baked. Use wire, like a coat hanger, to hang the parts or gun so you can access them from 360 degrees. Put a plastic dropcloth over your work area and wear a respirator, safety glasses, and gloves. You can buy finishing kits that come with aerosol spray cans, or use a paint sprayer powered by compressed air. Hold the can or sprayer 6 to 8 inches (15 to 20cm) away from the surface and spray each part or the whole gun with smooth, back-and-forth motions until all areas are evenly covered. Let the paint dry, then apply a second coat, if desired. Use sponges dipped in paint to dab on different colors if you want to camouflage the gun. Refer to the instructions on the paint to find out how long it takes to dry. Generally, paint will be dry to the touch in 30 minutes to 2 hours. Carefully remove the masking tape and any modeling clay or foam ear plugs from the holes. This should only be done to parts that have been disassembled from the gun, rather than an intact weapon. You can use a toaster oven to bake the metal pieces if the paint requires it. Use wire to suspend the parts from the top of the oven, then bake them for 30 minutes at 350F (177C), or as the instructions dictate. Use an oven-safe thermometer to ensure the toaster oven is operating at the correct temperature. If you haven't done this before, it can be helpful to refer to an exploded-view illustration of the gun, which can be found in the manual or online. You can also refer to the pictures you took when disassembling the gun, or watch online instructional videos to help you put all the parts back together correctly.
Choose metal paint designed for use on guns. Suspend the parts or gun in the air. Spray the parts with the desired paint. Remove the tape and clay or plugs once the paint has air dried. Bake metal parts if required. Reassemble the gun, if necessary.