Two weeks ago, I was trying to apply decals on my model’s tires to reproduce those 1960s Whitewall or Redline tires.
Actually, applying the decals was not the problem. However, the main issue came out after it dries when a glossy outline, quite evident in the dark background, appeared. The result was a disastrous loss of realism.
In the face of what happened, I decided on another strategy - Paint the tire strip. But how to paint a circular line in a such small piece? In the next lines I’ll explain step-by-step how I performed this painting technique with the help of 3D printing.
1)Defining the painting mask shape
In airbrush painting it is common for example masking-tape, used to limit the painting area on a surface. But, in a 1:25 tires, masks like that simply do not work. It should be quite narrow, due to the distinctive redline tire of the Camaro 67 Nickey series.
To reproduce the redline style I created a 3D two-compound mask, the first one to cover the rim of the wheel, and the second to cover the outside of the tire. Using a digital caliper, I took the tire measurements.
The modeling was done in FreeCAD using simple objects like cylinders as shown in the following images:
2) Printing
The printing was quite simple, it was necessary just 4 pieces of those two-compound masks. In this case, was used only Skirt + Built Plate Adhesion. I’ve avoided Brim, it could be a problem to remove the item without producing occasional damage on the internal edges of the mask.
3) Paint
Once the masks were ready, it was time to paint. In this case the colour was made using metallic burgundy (the colour of the car) as reference. But, instead of metallic I tried to make a satin version using a mix of glossy burgundy, matte red and small quantity of matte black.
Once the masks were ready, it was time to paint. In this case the colour was made using metallic burgundy (the colour of the car) as a reference. But, instead of metallic I tried to make a satin version using a mix of glossy burgundy, matte red and small quantity of matte black.
After the paint preparation, it was diluted than ready for use in the airbrush. Incidentally, I checked if the masks were well adjusted, to prevent any leaking under the mask. I painted the wheels in several layers to guarantee a good black covering, waiting a bit to it dry between each coat of paint.
To center the mask that covers the wheel, I’ve used multi tack (from Pritt). This is a versatile product and I normally use it for pre-assembly, attach small parts for painting and even as a mask for curved shapes. It is very easy to remove from the pieces and is possible to reuse it several times.
Conclusion
This experience has showed that a 3D printing also can be used as an powerful auxiliar tool for plastic model kit. Using your creativity, it is possible to do several interesting things. I've already printed some accessories to help me in the hobby like:
Support for the brushes;
Clamp "C";
Paint mixer;
Airbrush washer cover, among other things.
And, all the parts for my garage diorama, which I will soon post on here, were done using 3D printing.