How to paint spray properly? Choose the right spray pressure
Hi, today in the Airless Discounter video series We are going to talk about how to choose the right pressure while you are at spraying How to spray correctly with an airless paint sprayer using the right pressure level? A problem that we again and again see with our customers is that They spray with too much pressure or too little pressure Generally the problem is too much pressure When you work with too much pressure, the paint particles are sprayed out too fast Which creates a denser overspray, which means you need to be more careful with the masking You also use up more material. Moreover, the spray nozzles is under a stronger load which translates into a higher wearing for the machine and the accessories The other side of the problem would be when you work with too little pressure Too little pressure means that you will have a patchy spray pattern especially on the edges of the spray jet On the edges of the spray pattern you will have too much paint, while in the middle of the spray pattern the paint will be patchy We will show this in a few moments We prepared the wall, ok, it might not look beautiful but for our purpose it is just fine We will begin spraying with little pressure first 50, 60, 70 bar So that you will get the picture Thereafter with the maximum pressure We will be working with a PS 3.29 by Wagner, with a max. pressure of 221 bar Then we will compare too much pressure with too little pressure So finally tackle the main question, how to choose the proper pressure And how to we get the best spray pattern. Let’s go now! We will start with low pressure, we are 80 bar now and we will lower it to 60 To briefly show how the spray pattern looks like, when you work with too little pressure We see here very clearly that the spray pattern is not uniform We have here this very typical edge formation Which you have when you work with too little pressure or when the nozzle is worn out So it is not always because of the pressure, if the pattern looks like this It could be because the nozzle is worn out So we have the stripe formation on the edges, and in between not so much material with another material stripe in the middle, so it was very clear That here we were spraying with not enough pressure So now we will increase the pressure to compare the results We will work with the maximum pressure now, 221 bar So it may not look very beautiful now but it is perfectly ok for our purposes Where is the problem now? We have here a lot of material, maybe even too much material The spraying is very strong and with this pressure of more than 200 bar We have here a uniform spray pattern, but you would use too much material And with a lot of overspray Even if it does not necessarily looks like this now. But with a larger surface Then it would be very very easy to notice that the overspray would be excessive Just unnecessarily too much overspray So the next question would be: what’s the best way to set the right pressure. It would be best to start with a lower pressure Then do a couple of spray trials on a carton or just on the side or like we have it here on a piece of paper When you have a new material which you don’t know, the best way to try it out is probably By gradually increasing the pressure At the beginning you will likely get a spray pattern similar to this one But you will notice that by increasing by 10, 20, 50 bar that the spray pattern becomes better And from that moment on you will not need to increase the pressure anymore The most important thing is that the spray pattern is uniform Without disruptions We will do another little test, we start with around 100 bar And then we will progressively increase to find out what the optimal pressure is So now at 100 bar, we will do just a little stripe here so that we can have a few of them right side by side to compare So what we see here now is not really ideal, not really a very uniform spray pattern and too much material on the edges So let’s increase the pressure to 130 bar because we can clearly see that that was not enough Here compared to 100 bar we clearly have a much more uniform spraying pattern I would say we increase the pressure just a tad more, maybe to 150, maybe even a bit more, because the material here is thick So we have a pressure of 160 bar now and I am really confident that we are going to be satisfied with the result now So it looks definitely much better now, we could increase the pressure even a bit more, But I believe it is already very easy to notice how the result looks like when we have too little pressure And we see a clear development, so that it is certainly worth it to do the effort and find the right pressure Those who do not have so much experience with airless sprayers and maybe would like to get the hang of it Before you try with paint for the first time, I would suggest to test the whole thing with water first And try to spray with water to find the optimal pressure like I did just now, on a cardboard, on a wall Of course you would see it much more clearly with paint, but you can get a sense of it with water too You can start by 0 and then slowly increasing the pressure from 0 to see how the water is been sprayed, at first not very uniformely And then you will notice how the spray pattern becomes more evenly This would be the first test just to try it out, to do some practise without wasting material I hope this video will turn out to be helpful for you. If you have any questions on this or other aspects of airless spraying you can always call us through or send us an email. Bye bye!