Propeller spinners and painting stripes.

Discussion in 'Painting Questions, Tutorials and Guidebooks' started by [SC] Arachnicus, Feb 6, 2013.

  1. [SC] Arachnicus

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    I am suffering with the lack of ability to be able to paint a stripe on a propeller spinner cap. Does anyone have a trick?
     
  2. Crimea_River

    Crimea_River Well-Known Member

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    Do you mean a spiral, concentric rings, or something else? Would help to post a pic or profile of what you are trying to do.
     
  3. [SC] Arachnicus

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  4. [SC] Arachnicus

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    I tried using a circles stencil, then put graphite from a pencil inside, then press it down to make the lines around it to mask it that worked well. But what did not work well is applying liquid mask that I wanted to keep white. The paint lines looked like a 4 year old did them.
     
  5. Crimea_River

    Crimea_River Well-Known Member

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    Ah, good old conic sections! There would be a mathematical way to figure this out but it would make my brain hurt. A truly accurate mask for the white section would take on a C-shape but I would go about it differently.

    First of all, check that the blue portion behind the prop corresponds to the seam where the spinner and backplate meet. If so, that's half the battle - just paint the blackplate before gluing it to the spinner.

    The problem with cones is that if you use straight pieces of tape, the edge of the tape on the smaller diameter will pucker and you won't get a clean edge. The trick is therefore to use a very thin piece of tape to define the edge you want to mask and use progressively wider pieces away from the edge where all you need to do is cover over a painted area. Assuming that you can define the backplate edge per above, I would proceed with painting the spinner in the blue colour first (normally you want to paint light colours first but in this case, it won't work). Once your blue has dried, place the spinner pointy side up on a dead flat surface and rig up a sharp pencil horizontally at the right height against the spinner to define where the white edge should be. Turn the spinner against the pencil, keeping it on the flat surface until you get a good pencil line around the spinner. Now, with a very thin strip of Tamiya tape, carefully apply it along the pencil line all the way around the spinner. Once you have a nicely defined line, continue masking the remaining blue areas or use liquid mask. Then spray the white a few very light coats at a time until you have a good, solid colour. Repeat this step at the rear white/blue demarcation line if it's not on the backplate seam, this time masking the white edge and painting the blue.

    If you're careful and patient, you can get a decent ring on the spinner. I used this technique to do this rather complicated scheme:

    110326 Prop.jpg
     
  6. meatloaf109

    meatloaf109 Well-Known Member

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    If you are of steady hand, you can mark the circles with a compass using the point on the backing plate and marking the lower edge of the circle. If I can find mine, I'll post a picture of what I mean.
     
  7. [SC] Arachnicus

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    Thanks! I usually have a steady hand, but apparently even though the pencil lines were perfect, the painting of the liquid mask was not.
     
  8. Jack_Hill

    Jack_Hill Member

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    No pic to prove it sry.
    Worked well with a vice stucked tiny 1.5 volts electric engine slowed by mechanical rubber gearbreak mean.
    Needed sure hand of course.
    Worked well even with 1/72 if fine natural handbrushes.
     
  9. Night Fighter Nut

    Night Fighter Nut Well-Known Member

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    I would suggest using a drill or bolt gauge. This is a card with several hole sizes in it. What you do is slip the right sized hole in the card over the prop and paint your first color. Let dry and later do the same with a smaller hole. What you end up with are straight bands around the spinner.
     
  10. Wayne Little

    Wayne Little Well-Known Member

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    I've never had to do it but the bolt gauge would be my chosen weapon...as i have a few circular templates that would do the job...
     
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