These are mostly from the 80's and kept in original boxes and packing. I have seen this most often with Mercator and Navis-Neptun, but seen it in others. The dark grey soft foam tends to lose its flexibility and seems to granulize when pinched. This has been mainly the Dark Grey foam, the yellow (white), pink or green ones don't seem to have the same problem. I haven't seen it with Styrofoam either.
I can't ascertain all storage conditions, but these were in a higher humidity lower altitude coastal area, but I have seen Superior foam from the 70's-80's do the same thing while kept here in the High Desert. (Superiors just need to painted afterwards, anyway).
I have a feeling that this may have been during the initial "green" recycling period, and packing was intended to deteriorate after a while, and where the foam met model, the paint oils reacted. (just a guess). It may also be a reaction between the oil in paint and the foam.
I would recommend examining models stored with foam for a long time occasionally. if the foam loses its texture and granulizes, get rid of it. You can get new foam from Sewing Supply stores that is designed for seat cushions readily.
Would like to know more about this foam deterioration, Doug.
Were these unused models in original packing or had a previous owner added his own foam (what sort?) for protection?
Had the models been subjected to heat, direct sunlight or damp conditions, do you know.
Can't say I've ever had a problem with long term storage in original packaging.
Should those of us with part of our collection on display but others stored in boxes be worried ?
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