Published on September 7th, 2012 | by Grant Barnard21
Which Airless Spray Tip Size To Use
Choosing the best spray tip for your airless sprayer is HUGE. Spending $25 to $40 is not the cheapest “lets try this” adventure. Lucky for you, Grants Painting an Indianapolis Painter has tried most airless spray tips in many situations. Read this guide for airless spray tip selection. Also note that some techniques require slightly different spray tips
Spray Rules Of Thumb
- The first thing to keep in mind is that the less pressure that you use – the less over spray you will get.
- Use filters and clean them regularly.
- Wash out pump after every job, color, problem…
- With water based products never rely on viscosity changes such as water or Floetrol like product to use a certain tip. If your pump cannot push the paint you need a shorter line or bigger orifice spray tip.
Graco Spray Tips Types
- Blue – Classic blue spray tips go with the blue duckbill guard. They last the longest and require the most
- Green FF – Green fine finish give a much better finish than the blue tips but can blow out pretty easy especially with debris running though the system.
- Green FF LP – Green finish spray tips with the “LP” indicate that they require less pressure. These tips also spray less paint and do not make the process faster but they deliver a finish with less orange peel.
Spray Tip Size Meaning
The tip size number system works the same with most manufactures. You see numbers like 213 515 717. The first number in the set of three numbers is the spray pattern size. It is half of the spray pattern height. So if the first number is a 5 then the pattern will be 10 inches tall. The second two numbers in the set of three is the orifice size. A 13 or 15 or 17 is actually .013 in or .015 inches. The orifice size will be a factor in controlling the amount of paint coming out of the gun and this will change based on how thin or thick the paint is.
What The Tip Size Chart Doesn’t Tell You
The tip size chart is very useful in deciding a tip size. You should gather that the orifice size lets much more paint through when size goes up just one number. The amount of paint that comes through is very much dependent of the power of the pump and the viscosity of the paint. So you must know that there is a HUGE difference between a 211 and a 213 or a 413 and a 415. The thing to consider is really the speed that the paint is being applied to the surface. A 211 will apply the paint about the same as a 413 or 513, it’s just the fan pattern will be double the size. And a 211 will put out paint much slower and with a nicer finish than a 213.
Correct Spray Tip Size For Spraying Trim or Gutterwork
Spraying trim and gutter-work can be very difficult. Spraying either a shiny surface or anything metal with the correct tip is imperative. These are two surfaces that will show any drips or heavy spots like a sore thumb. So use a very small tip like a 211, 213, 311, or 313. Since gutter-work or trim will have many 4 in or 6 in areas the 2.. or 3.. sized tips work the best. To prevent runs, sags, or other defects restrict the flow with a small orifice size like the 11 or 13. Beginners should stick with the 11 sized tips on surfaces that will not be back-rolled. Use of a filter will need to be used or the smaller tip will clog so much it wont be worth it to use a sprayer. Use at least a 100 mesh in the gun and sprayer when spraying with a small orifice size tip.
Correct Spray Tip Size For Spraying Interior Walls
Spraying interior walls should only be done if all items can be masked. Generally a 513 or 515 will do a nice job. Larger sized spray tips can be used with low pressure if the wall is being back-rolled or is on a rough surface that doesn’t need to be back-rolled.
Correct Spray Tip Size For Spraying Siding And Exterior Walls
Siding will always need to be back-rolled. As long as everything is covered well you can use a larger tip size like 515 to 617. Near windows, screens or near surfaces that will catch over-spray downgrade to a smaller tip like a 513 or 413. You can even switch to the smaller 211 tip that you used on the gutters.
Correct Spray Tip Size For Spray Painting Cement Block
Spray painting cement block is very easy. Simply use the largest tip that you can spray effectively. Remember that you still should stick to the size below the maximum rated tip size for less overspray.
Caring For Your Spray Tips – Spray Tip Maintenance.
Always keep the spray tips very clean. It can be very hard to do this especially if you are switching between tips. We use a small can of denatured alcohol to drop the tips when not in use. This will keep the spray tips clean and give the best finish.
In the front of a spray tip you can see the outside of the atomizer. If the atomizer is nicked during any cleaning process then the tip will malfunction