Prepping Before Painting?

Discussion in 'Miniatures and Scale Models' started by NNascati, May 3, 2019.

  1. NNascati
    NNascati Member
    I've ordered several models from Brown Water Navy in the "White Natural Versatile Plastic". Does this material need to be washed before I can prime and paint?
  2. Roolz
    Roolz Well-Known Member
    I'd highly recommend it (soapy water, toothbrush+elbow grease, rinse, let dry).
    There is sometimes (but not always) a bit of remaining nylon powder in the recesses, which literally drinks the paint.

    The SLS platic (Versatile plastic) naturally drinks the paint, since it's porous. So it typically requires more primer coats than other materials. But any remaining nylon powder makes it worse.
  3. NNascati
    NNascati Member
    Following Matt's suggestion, I scrubbed them with a dry toothbrush to remove any sediment, and then white primed. I had no problem at all painting them.
    Roolz likes this.
  4. Roolz
    Roolz Well-Known Member
    OK !
    As I wrote, washing/scrubbing SLS parts (White Versatile) is not always necessary.
    It highly depends on the geometry & size of the model, and of how the post-printing cleaning has been done by Shapeways staff (it's a manual process).
    Sometimes a model has about zero remaining nylon powder and doesn't need washing/scrubbing, sometimes another does.
    I for one always stay on the safe side, and wash :).

    Anyway, as you noticed, once it's correctly primed, SLS nylon paints almost as regular injected plastic (barring the roughness and porosity).