What Should I Look for in a Polyurethane Spray Gun?

What Should I Look for in a Polyurethane Spray Gun?

October 12th, 2017
Eric Emin Wood

Selecting a polyurethane spray gun that performs optimally and provides the quality your job requires can be a tricky process. With the number of products on the market, it’s easy to get confused, especially if you’ve never purchased a spray gun in the past.

What do I look for? What size do I need? What should it be made of?

These will among the questions you’ll ask yourself once you’ve decided to purchase a polyurethane spray gun. We’ve created a guide to lead you down the right path.

There are three types of purge or mixing style available in industrial spray guns to consider for your next job:

Air Purge: A single designated port design relies primarily on pressure for atomizing. When materials aren’t being spray, these guns use a blast of compressed air to keep the mixing chamber clean. These are the most widely available, and support both fan and round spray patterns.

Mechanical: A robust internal mixing design require more wear parts, but this type of spray gun delivers the widest range of output to mix ratio. These guns also clean the mixing chamber with a steel rod that works as an on/off valve when its actuated. They’re used for both coatings and spray foam insulation applications and allow both fan and round patterns.

Liquid: This variety of spray gun is similar to air purge options, but there’s an added liquid shot cleaner in the chamber with each trigger pull to minimize chamber build-up.

Selecting the Right Size
The mixing chamber on the gun you choose should be suited for the size of the job you need to complete. Naturally, the bigger the chamber, the more material you’ll apply during the spray job. Key to doing the job right is knowing what you’ll need to do it.

Nozzle setups
Different nozzle setups are used for different spray products. Some handle heavier paints better than lighter clear coats, and vice-versa. Seek out advice from your supplier - never hesitate to ask if you’re unsure, as your supplier will be more than willing to ensure you get your hands on the right product. Ensure every accessory you purchase alongside your spray gun, including the nozzles, are the right ones for the job.

What Kind of Materials Will You be Spraying?
It doesn’t matter whether you’re buying a new or used spray gun -you need to know the ins and outs of your spray gun before you buy it. That means knowing what material the gun is made from, what applications it’s meant for and the kind of materials you can use with it. For example, there are guns specially made for spraying clear coats, while others are made for primers or heavier paint materials. The best thing you can do, however, is to ensure that you’ve done the research necessary to purchase a gun meant for the specific application you need it for.

Selecting a polyurethane spray gun that suits you comes down to determining what the gun will be used for. Doing so will make the purchasing process much smoother, and get your spraying and producing quality work for your clients sooner rather than later.

Bolair has a selection of high-quality and affordable polyurethane spray guns from our suppliers Graco and PMC. Reach out today to see how we can help you make the process of selecting a polyurethane spray gun easier for you.


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