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HTE/RP vs HVLP vs Conventional Spray Gun

What sort of air paint gun should you buy?

Different types of spray gun have different pros and cons.

ir caps are critical to atomizing your coating well and each type of air cap atomizes in a different way.

Each cap also results in more or less transfer efficiency. 

Therefore, in this article we will examine the difference, benefits, and drawbacks of the HTE/RP, HVLP, and conventional spray guns.

HVLP

HVLP stands for High Volume Low Pressure.

As the name implies, the guns need large volumes of air and convert it to a low pressure.

The advantage is a soft spray that reduces over spray and saves on paint costs.

Besides, it can improve transfer efficiency to around 65 percent which is about twice as efficient as conventional spray guns.

A high quality HVLP spray gun will usually cost more than a conventional gun.

However, there appears to be limitations with control of the finish either because the spray guns are very sensitive to small pressure fluctuations or they produce unacceptable levels of orange peel.

hte/rp hvlp conventional spray gun

Conventional

Conventional spray guns have been around a long time and are widely used in the market place.

They utilize air at a higher pressure than HVLP spray guns. 

The benefit is that regardless of how thick the coating is it can be atomized by increasing the pressure and atomization can be higher than HVLP.

The drawback is that transfer efficiency is significantly reduced to around 35 percent which results in extra coating waste and increased coating costs.

If you have heavy bodied coatings like glues, epoxies, and zincs conventional air caps often make the most sense.

t is also the perfect option for a tight budget as they are cheaper than HVLP and HTE/RP guns.

CONVENTIONAL SPRAY GUN

HTE/RP

HTE stands for High Transfer Efficient, also known as reduced pressure (RP) spray guns, have been developed to overcome the problems associated with both of the preceding technologies.

Using between 9 and 12 cfm of air for a standard refinish gun both fine atomization and application speeds are maintained and transfer efficiencies of 70 percent to 80+ percent are being achieved depending on paint types.

Many European businesses are adopting the new technology knowing that they can meet and even exceed the strict environmental laws that apply whilst at the same time saving paint and energy in the form of reduced air consumption.

New technology paints rely more heavily on controlled minimum paint thickness or film build to achieve their characteristics, often using clear over base application to achieve the color and gloss required.

It is at this point that consistency of spray pattern becomes an important feature of the spray gun, allowing the lowest possible amount of paint to achieve the desired finished result.

In most cases this is achieved more satisfactorily with the latest technology High Transfer Efficient equipment, producing results with less mottle, which is difficult to control with heavy metallic base coats particularly with high silver levels.

The results are that the High Transfer Efficient guns are producing superior results to both HVLP and conventional technologies not just with high solid and waterborne coatings but across the range.

HTE/RP SPRAY GUN

Five tips to successful spraying

painting table on white color

1. Take a test spray

Manufacturer’s claims sound good on paper, but find out exactly how a gun feels, responds and performs by testing it yourself.

Factor in consumables usage when considering the costs of different gun types.

2. Air

Clean, dry air is the foundation to a good spray application.

With HVLP guns, you need high volumes of air, so make sure you match your spraying requirements to your compressor purchases.

Remember to factor in other air tools such as sanders and frequency of use, when calculating the size of compressor required.

3. Preparation

It is tempting as a painter, on a payroll incentive scheme, to take short-cuts in the prep but as many have found to their cost, saving time is only worthwhile until your first rectification.

4. Follow instructions

There are a whole range of fluid tip combinations depending on type of gun (conventional, HVLP, HTE) and coating.

Other variables include distance, psi, cfm and gun orientation.

Always follow the manufacturer’s guidelines.

5. Maintenance

Dirt particles are the enemy of the spray painter. Avoid them by regularly maintaining extraction, ventilation and air supply systems.

Drain all moisture traps regularly and clean spraying equipment including guns after every use, preferably using a dedicated gun washer.

What is transfer efficiency?
Transfer efficiency (TE) is the amount of paint that actually hits the panel as a proportion of the total paint used.

So a typical HVLP gun might allow two thirds of the paint in the cup to hit the panel.

That ratio is potentially even higher with the new generation of HTE guns. Why is a higher TE good?

Because more paint hitting the metal means less paint wasted and less paint in the atmosphere.

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