Sandblasting Cast Iron Radiators

Cast iron radiators are very prone to rusting. However, you can easily deal with rust through sandblasting. Sandblasting is a process in which a machine called a sandblaster is used to jet a stream of air and sand toward a surface to clean it of dirt, rust, and old paint. Sandblasting a radiator is a do-it-yourself task, but because it is quite meticulous and challenging, only experienced DIYers should do it. Here is a guideline.

• Detach the radiator. Carefully disconnect it, then bring it to the location where you intend to sandblast. Sandblasting should especially be done outdoors or in a well-ventilated area.
• Put on your safety clothing and gear. The sand will fly in all directions, so you need to protect yourself completely. First, wear goggles, a dust mask, and gloves. If possible, also wear a painter's suit to protect your entire body. If one is not available, you can instead wear a hooded long-sleeved top and a pair of pants.
• Operate the sandblaster. Begin sandblasting by preparing the sandblaster. When it is ready, stand at least six to eight inches from the radiator and aim the sandblaster at it. Make sure to move the sandblaster from one side to the other until you cover the entire surface.
• Reach the tight areas. Hard-to-reach areas must also be sandblasted, so remember to direct the sandblaster's nozzle at them. This will be quite difficult, depending on how tight the areas are. Regardless, it should be done meticulously.
• Go over the sandblasted areas once more. To further remove the rust, dirt, and old paint, shoot the sand at the radiator once again. You should increase the pressure or the temperature at this time. A temperature of around 200° F is helpful, but remember to base the temperature on the condition of your radiator. Again, make sure to move the nozzle from one side to the other. Stopping at one spot at any one time might cause surface damage.
• Clean the radiator. As soon as you are done sandblasting, remove the dust, sand, and paint flakes from the radiator's surface. Make sure to clean it completely. Once done, your radiator should be rust- and dirt-free.
• Repaint your radiator. First, apply primer to your radiator to give the paint a good surface to adhere to. When the primer is dry, you can begin painting. Remember to use paint that is appropriate for a radiator. Generally, metallic paints are not recommended. Also, read and follow the paint manufacturer's instructions carefully, especially if this is your first time repainting a radiator. After painting, let the radiator dry completely, then reinstall it in its place.

Remember that sandblasting is a time-consuming and messy task, so make sure you are very well prepared for it. Allow at least a day or two to complete it, depending on how rusty and dirty your radiator is. If you cannot complete it on time, it is better to have a professional do it than to keep it in the garage waiting.