To mill a groove in a 45mm round wooden rod, you can use a router with a straight bit or a table saw with a dado blade. First, mark the location and dimensions of the groove on the wooden rod. Then, secure the rod in a vise or clamp it to a workbench to keep it steady. Next, carefully guide the router or table saw along the marked groove to mill the desired shape. Make sure to wear appropriate safety gear and take your time to ensure precision and safety. **

To build a round arch for a wooden door leaf, you will need to first create a template of the desired arch shape using a flexible material like cardboard or hardboard. Next, transfer the template onto the wooden door leaf and carefully cut along the outline using a jigsaw or a bandsaw. Sand the edges smooth and apply a finish to the wood to protect it from moisture and wear. Finally, install the wooden door leaf with the round arch into the door frame using appropriate hinges and hardware. **

To paint wooden furniture, first, make sure the surface is clean and smooth by sanding it down. Next, apply a primer to help the paint adhere better to the wood. Once the primer is dry, apply the paint in thin, even coats, allowing each coat to dry completely before applying the next one. Finally, finish with a clear sealant to protect the paint and give the furniture a polished look. **

To remove gray water stains from wooden chairs and furniture, you can try using a mixture of equal parts vinegar and water. Dampen a cloth with the solution and gently rub the stained area in a circular motion. Another method is to make a paste using baking soda and water, apply it to the stain, and let it sit for a few hours before wiping it off. If these methods do not work, you may need to sand the stained area and refinish the wood. **

Wooden furniture can be weatherproof on the balcony if it is properly treated and maintained. Outdoor wooden furniture should be made from weather-resistant wood such as teak, cedar, or eucalyptus, and treated with a protective sealant to prevent damage from moisture and sunlight. Regular maintenance, such as reapplying sealant and storing the furniture indoors during extreme weather, can also help prolong its lifespan on the balcony. However, it's important to note that even weatherproof wooden furniture may still require some level of care and maintenance to ensure its longevity in outdoor conditions. **

To varnish waxed wooden furniture, you will first need to remove the existing wax by using a wax remover or mineral spirits. Once the wax is removed, sand the surface lightly to prepare it for varnishing. Apply a thin, even coat of varnish using a brush or cloth, following the wood grain. Allow the varnish to dry completely before applying additional coats, sanding lightly between each coat. Finally, buff the surface with a soft cloth to achieve a smooth, glossy finish. **

Yes, you can paint your wooden furniture black. Before painting, make sure to sand the surface to create a smooth and even base for the paint. Then, apply a primer to help the black paint adhere better and prevent the wood from showing through. Finally, use a high-quality black paint to achieve the desired finish. Make sure to let each coat dry completely before applying the next one. **

To darken painted wooden furniture, you can use a wood stain or a tinted furniture wax. First, lightly sand the surface of the furniture to remove any existing finish and create a rough surface for the new product to adhere to. Then, apply the wood stain or tinted wax in thin, even coats, following the direction of the wood grain. Allow each coat to dry completely before applying the next one. Finally, finish with a clear topcoat to protect the new finish and give the furniture a polished look. **