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Painting Aluminium Composite Material

2 thoughts on “Painting Aluminium Composite Material”

  1. Would shellac-based primer (BIN) be suitabe for use a s a primer over Dibond–over a polyester factory finish?

    Reply
    • Hello John,

      While we suspect that the adhesion would be good with the BIN Shellac based primer on the properly prepared polyester coating on Dibond ( sanded and cleaned ), we have not tested it so cannot say for sure. The other factor is that shellac is alkaline sensitive and so can be affected by the alkalinity of water borne acrylics or other alkaline compounds. We have seen that the white pigmented BIN seems to perform well with waterborne acrylic coatings over it, as it is often used as a stain blocker on house paint projects, but we have seen instances of alkaline sensitivity with plain shellac, and with the pigmented shellac ( BIN ) when used with India ink and our OPEN Acrylics. Here are some links to articles we published with some testing:

      Waterproof India Inks and Shellac Based Primers: https://justpaint.org/waterproof-india-inks-and-shellac-based-primers/
      Open Acrylics, Shellac and SID: https://justpaint.org/open-acrylics-shellac-and-sid/

      So, much will also depend on the specific media you plan to use over the BIN. If using our regular Acrylics, then we think it could work. If using India Ink or OPEN Acrylics we do not recommend using shellac based primers. Oil paints are most likely fine. If in doubt, then we recommend using the alkyd type primers or urethane primers we speak to in the article about painting on Dibond.

      Reply

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