Spray Painting?

Spray Painting?

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  • #824206
    Bo’sun
    Participant
      @bosun58570

      Are there any recommendations out there for a basic “Air Brush” or small spray gun.  I’ve never used one before, and don’t intend it for ultra fine work, so some expert guidance would be appreciated.

      I want to paint my, to be, model Traction Engine, and hopefully some future models.  I’m not a great fan of rattle cans, and wondered if an Air Brush/small spray gun might be an alternative?  I can at least then use paints I have on the shelf (assuming they’re suitable for spraying with the correct thinners).

      A look in the usual places throws up quite a few for use with propellant.  Presumably, that’s some form or aerosol can, and not suitable for use with a compressor?

      I have a small 4 CFM oil free compressor, so was hoping I could use that.  Ideally I’d like to have a transparent reservoir with a reasonable capacity.  Some look awfully small.

      #824221
      Richard Simpson
      Participant
        @richardsimpson88330

        Airbrushes is a huge topic and difficult to cover in a single post but, to start with there are one or two useful guidelines.

        Many fall into the trap of buying a cheap airbrush, thinking it will do what they want it to do and they don’t want to spend a lot of money.  Almost certainly using a cheap airbrush will lead to disillusionment and frustration.  As a guide, and, as always I’m sure opinions will differ, I reckon a good starting airbrush should be in the region of £100.00 to £150.00.  This should get you a good quality brush that will last for many years and give good enough performance for most tasks.

        You really need to do a bit of reading up first to learn about the differences between single action and double action as well as the advantages and disadvantages of cup size and position.  If you are thinking ahead and want to use the airbrush for a traction engine then you are looking at a larger cup and a wider spray pattern rather than a fine detail type with a smaller cup.  Your compressor will be fine as long as it fitted with a pressure reducing valve and a drier, both of which are available from airbrush suppliers.

        Start by having a browse around Airbrushes.com and Everythingairbrush.com, both very comprehensive stockists.  You also need to be thinking about location from an aspect of ventilation and safety.  i.e. do you want to set up a spray booth or use natural ventilation.  Masks and goggles are also things to consider.

        #824231
        Bo’sun
        Participant
          @bosun58570

          Thank you Richard.  Yes, when I started looking I realised the size and variation of the topic.  As mentioned I’m not a great fan of the rattle can (for this type of work), I would like more control over not just the process, but the final result.  I do have a pressure regulator and filter/drier for the compressor.

          I’ll have a look at the suppliers you mention.

          #824232
          Richard Simpson
          Participant
            @richardsimpson88330

            This is what might be considered a basic set up:

            27-12-22-02FensideBarnWorkshopWorktop2

            The compressor is a very cheap diaphragm type but the reducing valve and drier is a much better quality:

            07-12-18-09AirBrushCompressor1

            A really good airbrush for a beginner is the Iwata Revolution TR, which actually combines the dual function into the one trigger and, with the plastic handle, resembles a miniature spray gun rather than an airbrush.  The combined function of the trigger is frequently easier for beginners to operate.  The cup is also a reasonable size for wider areas:

            07-12-18-07IwataRevolutionTRAirbrush2

            Many might suggest a home made extractor, but there are potentially serious consequences if certain safety features are not considered.  The downside of a purchased extractor hood is that they can be very expensive.

             

            #824235
            Dave Halford
            Participant
              @davehalford22513

              These have been spoken well of on other forums some time back. Just about suit your comp as long as it has an auto off function. Jet size is a function of paint viscosity.

              If you do end up buying any car paint check there are no isocyanates in it. These days there are two pack paints that do not and some that do.

              #824236
              Richard Simpson
              Participant
                @richardsimpson88330

                I actually did an article for Model Boats Magazine a few years ago on the subject of airbrushes so I’ve pinched the section on the brushes themselves here:

                Probably in itself the single most important piece of equipment is the air brush.  Consequently you need to get it right and for that you really need to get one in your hand.  It must feel comfortable and be easy to use, it must work well, be easy to clean and maintain and last you for many years.  Avoid the very cheap ones, they will not atomise the paint properly so they clog quickly and they are difficult to clean.  They tend to be unreliable as well and you will spend far too much time messing around with it.  I would suggest that you should be looking to spend around £100.00 to £150.00 on the air brush, something along the lines of an Iwata Revolution CR air brush.  I would also go with an established well known proven manufacturer such as Iwata, who will provide spare parts, back up and support as necessary.  You will need to decide on whether you want to go for a single action brush, where you only have a single button to push to operate it, or a double action where you push the button down for the air flow and pull it back for the paint flow.  I personally have never really felt comfortable with the normal push button double action airbrush as my finger just doesn’t seem to have the control necessary in two different planes.  However I did find an Iwata version of the Revolution model that combines the two actions into a trigger operation, called the Iwata Revolution TR-1, and I find that much easier to control.  It is called double action but, in reality it is two steps of the trigger and you basically feel like you are holding a miniature spray gun.  The established and proficient air brush users are not as keen on it but those who struggle with the single finger operation and who find learning a whole new skill a challenge this brush works well.  I also like the big plastic handle as, again, I feel like I have better control over it.  I also use an Iwata Revolution CR and try to get more and more proficient with it but invariably end up going back to the trigger type TR-1.

                #824237
                Richard Simpson
                Participant
                  @richardsimpson88330

                  Purloined from the same article, this time the spray booth:

                  The booth, as with everything else, can be pretty basic and cheap or it can be comprehensive and expensive.  I would strongly recommend that you resist the urge to build your own, despite the huge number of on line tutorials suggesting how cheap and easy this can be.  The pitfalls are usually smoothed over, if not completely ignored, and if you want to enjoy further reading on the subject I would suggest you look up ‘Intrinsically Safe’ and ‘Explosion Proof’ on line as related to electrical equipment before going any further.

                  At the one end of the scale there are very simple extraction booths that provide the work area with a slight negative pressure to ensure all particles flow into the filter and they vent through a large hose to outside.  Consequently you need access to outside, which can be a challenge in adverse weather conditions.  My own booth is of a much more comprehensive filter arrangement with a multistage filter, arranged to extract all particles from the air.  This means that the vented air is perfectly clean and so the unit can vent from the back of the unit directly into the room you are in.  Not surprisingly these booths are a lot more expensive but their advantages give you much more flexibility in location and there is no reason why, if looked after it should not last you for a very long time.  Replacement filter cartridges are readily available and should only be changed when necessary and with light hobby use should last for a number of years.

                  #824238
                  Richard Simpson
                  Participant
                    @richardsimpson88330

                    And finally a word on accessories:

                    Finally there are one or two accessories that are well worth mentioning as they are so useful you will wonder how you managed without them.

                    First up is a good quality daylight lamp.  You might want to progress to one either side as I always seem to find myself in my own shadow but one is essential.  Mine is fitted with daylight standard LEDs and gives a superb light.

                    Next up a cleaning pot.  This initially seems like a gimmick but it is superb.  When you want to blow some thinners through the air brush you put some in the cup and blow it through at full pressure into the pot.  The pot separates the thinners out and leaves you ready to put your next paint in.  When you get into a rhythm of operation with your air brush you will find that cleaning and using it can actually be easier than cleaning a paint brush.  You will need a cleaning pot though.

                    Daft as it may sound plastic disposable pipettes are also very useful.  I use them for transferring paint and thinners to the paint cup and mix all my proportions in drops.  Using plastic pipettes keeps everything clean and tidy and helps prevent getting paint into places where you don’t want the paint to be.

                    Apart from that there is kitchen roll, pipe cleaners, paint stirrers, dishes for various thinners, a turntable and all sorts of other bits and bobs that you will decide for yourself what works best and what are just getting in the way.

                     

                    Another good contact I forgot to mention is Graphicair.com

                    #824245
                    JasonB
                    Moderator
                      @jasonb

                      I tend to use my Iwate Neo which is very similar to the one Richard shows on the model engines. I did sell Badgers for about 20 years and serviced most makes. I have several of Badger airbrushes but the Iwata is better for bigger areas and takes both side cups and bottles ( clear)

                      https://airbrushes.com/product_info.php?cPath=400_403_1_299&products_id=21659

                      #824277
                      HOWARDT
                      Participant
                        @howardt

                        I used a cheap one that connected to simple air canisters years ago to spray with Humbrol oil paint plastic kits.  It worked well and did a fine job at a time when I could afford little else.  Yes if i wanted to do the job now I would probably spend a lot more on a better setup, but the finish is in the preparation and technique rather than the tool.

                        #824281
                        Richard Simpson
                        Participant
                          @richardsimpson88330

                          The Iwata Neo has many similarities with the Revolution TR-1 and can basically be considered the latest version of it.  Again it is like a miniature spray gun but has the accuracy and flexibility to perform fine work as well.  A superb airbrush.

                          Just a suggestion for paint, I’m sure many of you already know of Craftmaster enamels but, for those who don’t, it is a beautiful paint and well worth considering for model engineering use.  It can be brush painted or airbrushed/sprayed for a beautiful resilient gloss finish.

                          #824332
                          Dalboy
                          Participant
                            @dalboy

                            I use a similar compressor to Richard, except it has the double head compressor chambers. For things like coloured wood stains I use a cheap air brush. For more elaborate work, I resort to my Harder and steenbeck ultra x.

                             

                            DSCF4493

                            wooden vase using the cheap one with wood stain

                            DSCF1870

                             

                            DSCF1871

                            #824490
                            old mart
                            Participant
                              @oldmart

                              My firm used to make parts for aircraft, so the paint requirements were strict. If any rework was needed we used a cheap airbrush and always kept a new replacement one in a cupboard. As soon as one gave any signs of trouble it was discarded and the manager would get a replacement. As with any paint sprayer, the onus is on the owner to clean it properly after every use.

                              I would recommend not paying a huge ammount until you find out if that is the solution to your painting requirements. You might get fed up with buying and mixing paint as well as cleaning the gun every time.

                              #824580
                              James A
                              Participant
                                @jamesalford67616

                                For seemingly well-informed advice on spray guns and compressors, visiting this forum might worthwhile. I find it to be a very helpful, friendly place with sound advice. Like this group, it is not full of people who insist that only the most expensive equipment is worth having. People give due consideration to products in the lower end of the market as well.

                                https://www.mig-welding.co.uk/forum/forums/paint-metal-coatings-and-media-blasting.41/

                                James.

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