Choosing The Correct Spray Painting System
Conventional Spray Painting - Compressor, Filters & Hose
Conventional Pressure Fed Spray Painting is the traditional system of Spray Painting and involves having an air compressor supplying compressed air to a paint source. When the trigger on the gun is pulled, the air and paint mix and the paint is released from the gun in a mist form. Compressed Air spray painting allows for the widest choice of spray guns. These choices include the style, suction, gravity or pressure fed, the spray pattern, the nozzle size and the overall gun size.
This system can give some of the most amazing results whether using a small air brush or a fully automated gun. However there are some things to consider when choosing this set up.
1/ The Air Compressor
The air compressor is the most crucial component in a conventional spray system. It is often the main reason for poor results. Spray guns are air hungry, every gun will have an ideal Air Rating - CFM (cubic feet / minute). This air needs to be supplied by the compressor, if not met, you will have poor atomization, excessive paint build up and less than desirable results.
When choosing a compressor for spray painting, look for the highest CFM you can get for your budget, however at a bare minimum it needs to be bigger than your guns requirements.
Most single phase compressors struggle to meet the requirements. If 3 phase is not an option, have a look at petrol compressors, as these provide great performance to cost ratio.
Do not compromise on the air compressor!
2/ The Filters - Keep the moisture out!
Water condensation is a byproduct of compressing air, the amount of water created will vary depending on a range of factors including temperature, humidity, air pressure and the size of the compressor. Water in the air supply will mix with the paint and can create a multitude of different issues. The water needs to be removed. Inline filters are a cost effective and convenient way to remove moisture from the air supply.
When using a conventional spray set up, although not essential, they are well worth the investment, especially if you are doing a lot of spraying.
3/ The Air Hose - It's more important than you think!
When choosing an air hose you need to consider 3 factors - Length, Diameter and Material.
Length: the pressure will drop over the length of the hose, go as long as you need not as long as you can.
Diameter: the bigger the hose, the more air it can carry, match the biggest ID hose you can with your compressor.
Material: When spraying, you will have to hold the weight of the hose, this is the outright weight as well as the coil effect.
PVC - Light although tends to kink and coil - (approx 1/4 the weight of rubber)
Rubber - Heavy, durable and lies flat - No coil fight
If you do not know what you need, get in touch and I will ensure you get the best product for your application.