With so many different variables to consider when purchasing a spray gun for your project, it can often be difficult to know where to start. You’ll need to choose the right type of gun for your needs, from airless spray guns to graco spray guns, and you’ll find a huge range of different spray guns for sale online. We know that choosing the right spray gun can be a challenge, which is why the team at Ultrimax Coatings has gathered together a wealth of information to help you to select the right spray gun whatever your project, whether you’re looking for an airless spray gun or an HVLP gun.
What is a spray gun?
Spray guns are similar to airbrushes but they generally use larger equipment and are used to cover bigger surface areas with an even coating of liquid. You’ll find hand-held as well as automated spray guns with interchangeable heads that allow for different patterns of spray, as well as high-end guns which can be customised and completely rebuilt. Every air gun has an air compressor, paint basin and nozzle. When you press the trigger, the compressed air and paint mixes paint mixes. This is then released from the spray gun in a fine spray to cover your surface. We’ve highlighted a few of the most important variable to consider when picking the right spray gun.
Select the right nozzle for the job
There are a wide range of different nozzle types to choose from, but the three most common are flat stream, hollow cone and full cone nozzles. The type you choose will depend on the project you are working on – for example, for a fine finish over a larger area, a full cone nozzle may be the best option, whilst for a smaller area and a more precise result, you may be best selecting a flat stream nozzle.
HVLP, LVLP or conventional?
High volume low pressure (HVLP) guns allow a higher proportion of paint or coating to reach the target surface. Not only does this reduce the amount of materials you’re using (and wastage of materials), it also helps to prevent unneccessary overspray. These types of guns are often used for architectural coatings, interior decor or furniture finishing.
Low volume low pressure (LVLP) guns are practically identical to HVLP guns but are amongst the best and most efficient guns on the market. This is because they minimise paint wastage and operate at a lower pressure, using a lower volume of air than HVLP guns. This decreases the amount of air consumed whilst increasing the amount of air that reaches your target surface. However one disadvantage of LVLP guns is that they are normally more expensive than other types of spray gun.
Consider the CFM rating
You might see the CFM rating mentioned on spray guns and wonder exactly what that is. The amount of air needed to complete a project is measured in cubic feet per minute or CFM for short. This amount can vary greatly but all compressors will have a CFM rating, normally shown in the following way:
16CFM@ 90 PSI
The rating is at the output of the compressor tank, so the actual CFM at the gun can vary depending on the diameter and length of hose and fittings you use. Using a shorter, larger diamater hose and eliminating fittins means you will get more CFM at the gun for more precise results.
Consider the viscosity of your paint
Whilst viscosity is generally measured as low, medium or high, you may want to check technical information for your paint as a specific spray gun may be recommended. Some guns are more suited to heavy viscosity soatings. Generally speaking, the finish you are looking for will affect your choice of gun. Bear in mind that a conventional gun uses twice as much paint as an HVLP gun.
What about your production requirements?
In other words, how fast is your spray gun? Using larger air caps and fluid nozzles can speed up your productivity. The higher the CFM of the air cap, the heavier viscosity coating it can atomise. For high volume painting projects, using a pressure pot to feed your spray gun is ideal, giving you greater air pressure control. For the ability to paint continuously, a diaphragm or fluid transfer pump may be best. Low viscosity paints and small scale projects can use a gravity or syphon feed spray gun. In some cases, you may find an airless spray gun is the best option.
Lastly, consider the diversity of your gun
Think about how often you are going to use your gun and the types of projects you will be working on. When it comes to spray guns for sale, it is often worth investing more in a high quality gun such as a Graco spray gun, as these generally have more choice of fluid nozzles and air caps, and can usually be totally rebuilt. Lower cost guns suffer from limited set ups and are often not rebuildable.
These are just a few tips to help you pick the right spray gun for your project – there are many more variables to take into consideration too. Remember that by spending a little more on your spray gun you will benefit from more customisation options and a more versatile gun!