What Size Spray Tip Should I Use with my Spray Gun?

It’s crucial to get the right spray gun nozzle tip size for your project for the ultimate professional results. But how do you know which one to choose? Our team of experienced painters has identified the five key factors that need to be taken into consideration when selecting the right nozzle tip size for each job. We’ll make sure you have all the advice and guidance needed to make an informed decision, so your project can look amazing with great coverage and finish!

KEY TAKEAWAY

1. Get the perfect size of spray gun nozzle tip to suit each job requirement.
2. Benefit from our comprehensive step-by-step guide that simplifies the selection process.
3. Access our expertise and knowledge to make the right choice without hassle and confusion.
4. Avoid costly mistakes by selecting a nozzle tip of appropriate size according to your needs.
5. Take advantage of our tailored advice and insights to enhance the efficiency of your work.

There are three main factors to consider when determining the size tip that will produce the best results.

1. First, examine the coating that will be sprayed. Put simply, heavier coatings will require a larger orifice size than lighter ones. For example, primers are usually thicker than the accompanying paint so you should use a 1.7 or 1.8 mm tip to prime most surfaces. Most painters will stay in the range of 1.2 to 2.0 mm unless the paint being applied is specialized. (See chart below.)
2. The next thing to consider is your project surface area. This determines the appropriate fan width that your sprayer will produce, that is, the shape in which the product will leave the gun nozzle. Airless spray guns have more control over the fan width than conventional spray guns because the coating is forced through the tip without being atomized by air. This causes the tip to have a large impact on the fan width and shape. Most boat projects consist of large surfaces and so a wide fan will increase the spray coverage and also provide the ability to spray close to the surface without too much build up. Smaller surfaces will require a small fan width to reduce overspray. This also makes it possible to spray further away from the surface without too much falloff because the fan is more focused.
3. Lastly, consider the spray gun that is being used. Make sure that the spray tip you plan on using will be supported by the gun. Most spray gun manufacturers will provide this information in their product overview. The Bottom Paint Store distributes ES Manufacturing Gelcoat Spray Guns. The ES G830 gun will support a range of 0.8 – 2.0 mm. The ES G100 and G200 gelcoat spray guns support a range of 0.8 – 7.1 mm tips. If you aren’t sure about your gun’s supported sizes, check with the gun manufacturer.

Common Spray Tip Sizes and Their Uses
Tip size (mm)	Commonly Used for
0.8	Parting Films – PVA – very fine mist
1.2	Clear Coats – super fine finishes
1.4	All Around Tip – clears, base coat, single stage paints
1.6	General Purpose – light to heavy viscosity materials
1.8	Primers – will apply primer quickly
2.2 -2.5	Gel Coats and Resins – for thick resins and not paints

Frequently Asked Questions (FAQ)

1. Why is selecting the right nozzle tip size important when applying gelcoat?
   The nozzle tip size plays a crucial role in achieving a smooth and even finish when applying gelcoat. If the nozzle is too large or too small, it can cause uneven application, overspray, or a finish that is too thick or too thin. Selecting the right size ensures better control and optimal results.

2. What happens if I use the wrong nozzle tip size?
   Using the wrong nozzle size can lead to several issues, such as poor gelcoat coverage, inconsistent texture, overspray, or excessive wastage. A nozzle that is too small may cause clogging or slow application, while one that is too large can result in an uneven layer of gelcoat.

3. How do I determine the right nozzle tip size for my gelcoat application?
   The right nozzle tip size depends on factors such as the type of gelcoat, the thickness of the coating, and the specific spraying equipment you’re using. A general rule of thumb is that a 1.4mm to 1.8mm nozzle works well for most gelcoat applications. However, it’s essential to consult the manufacturer’s recommendations and consider your equipment specifications.

4. Can I use the same nozzle tip size for different types of gelcoat?
   While you can use the same nozzle size for various gelcoats, some formulations might require adjustments. Thicker gelcoats may need a larger nozzle, while thinner ones may perform better with a smaller tip. Always test the setup before starting a large project to ensure a smooth application.

5. Should I use a different nozzle for each layer of gelcoat?
   For some projects, especially those involving multiple layers of gelcoat, it may be helpful to use a different nozzle for each layer. A larger nozzle can be used for the base layer, while a smaller one may be better for final touch-ups and detailing. Always check the viscosity of the gelcoat before selecting the nozzle.

6. Can nozzle tip size affect the finish quality of my gelcoat project?
   Yes, nozzle tip size can directly impact the finish quality. A nozzle that is too large may lead to excessive gelcoat application, while one that is too small may result in a patchy finish. For the best results, selecting the appropriate nozzle size ensures an even and smooth coat.

7. How do I clean my nozzle tip after using gelcoat?
   Proper cleaning of the nozzle is essential to maintain performance and extend the life of your equipment. After each use, make sure to thoroughly clean the nozzle with the recommended solvent or cleaning solution to remove any leftover gelcoat or debris. Regular maintenance prevents clogs and ensures consistent application.

8. Can I use airless sprayers for gelcoat applications?
   Yes, airless sprayers are commonly used for applying gelcoat, especially in large projects. When using an airless sprayer, make sure to select the appropriate nozzle size, as recommended by the sprayer’s manufacturer or based on your gelcoat thickness.

9. How can I avoid overspray when selecting a nozzle tip size?
   To reduce overspray, select a nozzle that provides the correct spray pattern and pressure for your gelcoat. Using a smaller tip and lower pressure settings can help prevent excess spray. Additionally, consider using a spray shield or mask to control overspray during application.

10. Where can I find nozzle tips for gelcoat spraying?
    Bottom Paint Store has them. You can find them here: https://www.bottompaintstore.com/fiberglass-and-gel-coat-repair-gel-coat-spray-gun-and-tools-c-13581_13592.html

By considering these five factors, you can ensure you select the appropriate spray gun nozzle tip size for each job. If you have any questions or need additional guidance on selecting the right size, the experts at the Bottom Paint Store are here to help.

Bibliography Research Data

http://boatpaintguide.com/gelcoat-spray-gun-the-right-tool-for-a-great-job/#.U_80dfldVWg

http://esmfg.com/aspnet_client/g860_hvlp_gelcoat_spray_gun.html

http://www.finishsystems.com/qanda.html

http://www.international-marine.com/paintguides/mpg_paintapplication.pdf

http://magnum.graco.com/products/M_Pages.nsf/Webpages/0Spray_Tip_Info

http://www.carcraft.com/howto/ccrp_0511_paint_spray_gun/#ixzz3Bheyr89Z