How to Mix Paint for a Spray Gun

How to Mix Paint for a Spray Gun


I’m Scott. I design build and repair
woodworking pieces I’m opening up the doors to my shop to help you become a better woodworker Since publishing the video on how to spray-paint the staircase and wainscoting we’ve had a number of questions about how to spray paint This is the first video in a series we’re going to use to answer those questions We’ll answer questions about how to use a spray booth in a small shop, how to make sure you’ve got the right air cap set or nozzle on your sprayer, the difference between airless spray and HVLP spraying, and some clear finishes This video is going to cover off a question we had from our viewer that asked how to dilute paint for a paint sprayer Thanks for asking the
question Ben. Here’s your answer To measure the thickness of a finish
you need to viscosity cup What I do is I put the finish in my container here and I’ve put the cup inside until the fluid is overtop of it and then I start timing as soon as that that breaks the surface of the fluid I time how long it takes for this fluid to start to turn to a drip I’ve got a clock here I use that reference That tells me how many seconds I’ve got to get through that cup and I use that with my reference guide to figure out the right viscosity of the paint or the finish I’m working on Inside my spray manual there’s a section here that’s called the viscosity guide Here you use a viscosity cup to measure how long the fluid takes to get through the cup There are a number of different measurements here For latex paint it should take 20 to 30 seconds For primers it’s 30 to 40 For stains they go on undiluted And polyurethane should take 20 to 25 seconds to go through the cup I’m mixing up some primer for the paint sprayer so I can get some boards ready for a paint test but this primer you can see is really thick right out of the can You can see how it sits on top of the paint and slowly merges in I’ll show you with the viscosity cup how that’s far too thick I sped up this video and you can watch the second hand on the left-hand side here As the time goes by, I’m looking for a viscosity of 30 to 40 seconds for this primer but as I finish this at 40 seconds you can see there’s far too much paint in the cup I only paint with water-based finishes so I keep a clean container of water in my shop It’s a matter of experience that teaches you how much water to put in The first time I ever did this it took me about 45 minutes just because I was adding a little bit of water at a time and I didn’t want to overdo it What you need to do is really mix it up well and then you can test it out with a
viscosity cup I sped this up because there’s nothing worse than watching paint move but I’m going to slow it down right near the end so you can see what it looks like when it transitions to a drip This is normal speed here and
there you’ve got the drip I’ve got a 35 second viscosity here which is perfect for what I’m looking for, between 30 and 40 seconds A paint sprayer can work so fast and gives you the quality you just can’t duplicate with any other method this is something I’ll teach you more about in upcoming videos If you like this video please give it a thumbs up so others can find it and don’t forget if you subscribe down at the bottom here You’ll get notified when our next video
comes out the next one we’ve got scheduled for is this knock down booth that I use in my small workshop I’ll show you the ins and outs of how it works and how you can build one as well Until next time, enjoy your time in the
workshop!

39 thoughts on “How to Mix Paint for a Spray Gun

  1. I don't normally paint my projects, mostly because I don't know how. Watching your videos has given me a basic understanding.
    Maybe I'll give it a try. Thanks.

  2. Thanks for this great video, very informative. I think I may have been diluting my paint a little too much. I have a 3 stage machine but annoyingly there's not listing for latex in the manual when it comes to viscosity just needle sizes. Have you ever tried Floetrol?

  3. Really enjoy your vids! Please keep them coming. I have a question: I am going to paint our cabinets white, and purchased the mini-mite 5 and a 1.8mm nozzle set. I am going to use Stix and BM Advance. I decided on a 5 stage to give me a better chance at a pro finish without having to thin my paint much. I have read claims that a 5 stage can handle the BM Advance straight up, do you have any thoughts on this? Should I plan on thinning a little bit?

  4. Super, thanks. I painted cars 35+ years ago and now I’m trying to re-launch on HVLP and furniture. It’s reassuring to follow you through it. At least the drip cup hasn’t changed😀

  5. Thanks for sharing.The drip cup method you use is more precise than some other methods. What size nozzle do you typically use for the latex paint? Do you have another video for the nozzle that works best for latex? In your opinion what is a durable latex brand?

  6. Brief and very informative lesson that has helped me immensely. …… much love from Northern Ireland

  7. Can you use water on non-water based paints such as an acrylic paint? If yes, what is the difference to using paint thinner over just water?
    Thank you.

  8. Do viscosity requirements change depending in whether you are using gravity feed or siphon cup? Also, if you spray latex, do you prefer a larger orifice size and thicker paint, or thinner and smaller orifice?

  9. use to put a metal rule in a pot then pour in 6inch of paint then pour in thinners until the measure rose to 12inch easy

  10. Hi, first of all I apologize for my language but I do not speak English very well, I'm from Argentina and I like your videos. I would like to know what tip measure you used for water enamel, 1.5 mm or 2 mm. Gracias!

  11. Dear Home Improvement Woodworking;

    I have a simple question.
    I have a 40 year old stockade fence. I usually paint it every
    couple of years with Bear Paint. This year, I want to
    do something different. I want to use a sprayer instead
    of a paint brush. I want to use white wash with a warm color
    water based paint. And here's the extra step; I want to add
    Elmer's glue to make that paint stick real tight.

    I'm not sure how much glue to add to the water, before
    combining it with the paint. What would you suggest?

    Because of maintenance, the fencing is in pristine shape.
    But with more humid rainless summers, and brutally cold
    dry winters, I can optically observe how it is effecting my neighbors
    fencing. I figure, I can lock out the environment much better if
    I use Elmer's as a sort of deflector screen. If that makes sense.

    We've all seen in high-school wood shop how an Elmer's glued
    joint between 2 pieces of wood is actually stronger than the
    wood itself. Thus the same principle should apply to paint and wood.

  12. Thanks for the great video. May be a stupid question but doesn’t thinning the paint force you to do more coats? I’m thinking of using a spraygun for a deck which usually takes thicker paint anyway. Last thing I want is a thin little layer of paint on the boards. 🙂

  13. Thank you for the video!! After reading my manual I was very confused about viscosity cup and drip times. This helped so much!

  14. قد اكون انا المتابع الوحيد لديك المتحدث بالعربية
    وانا من اشد المعجبين بمحتوي قناتك واتمني انا تدخل الترجمة العربية علي محتواك
    وشكرآ لك

  15. Well thank you for that basic video can't wait to see the next one. I'm so happy the way you explained it nice and easy. 👍⭐⭐⭐⭐⭐

  16. As a 65 year old HVLP spray paint beginner, I truly appreciate you making this and the other videos!

  17. Hello, thanks for the video! I have a few questions, I am not painting a home improvement project, but rather an electric guitar body. I don't have a controlled climate, but rather outside in which I must spray. The finish is Candy Apple Red that I am going for, so there are many layers, different colours and flake. I am on my 2nd last amount of spraying which is a self dyed red in a General Finishes water based clear coat, High Gloss.

    1. How can I tell if my spraying and drying are going well or poorly?

    2. How much do I have to sand until orange peel is no longer an issue?> all the way until there are no visible orange peel lines or just until they are knocked down?

  18. I used wood primer with oil already on my dresser. But I want to use deco paint. Can I spray deco paint on this dresser? Because somebody told me if I used wood primer so I need to go with oil base paint. What I should do?

  19. Great video. Brief and to the point. Never looked for this info before but want to use my new compressor for outside painting so great help. Thanks

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