Everything faded to grey before my eyes …

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That is to say, I sprayed a couple of coats of grey primer over the whole model Nothing fancy, but "Spectrum" brand primer from an Action discount store, and that cost me all of, IIRC, €2.99 for a 400 ml aerosol can. But it covers well, and dries quickly and hard. However, when spraying it I realised I should have gone for white instead, as the grey was almost the same colour as the plastic so it was hard to see whether I had missed some spots.