Hi Mary,
I also have problems with high humidity, mold, etc with my work. Mold loves fresh oil paint, it seems. Some years ago I painted quite a few oil on ply pieces. Sealed the support, dried the paint, even varnished the pieces. Finally had to discard them because the mold penetrated throughout.
I now paint only on stretched canvases and mostly don't have any problems.
The best recommendation you can make to your clients is that they hang the piece on an internal wall.
I have a beautiful watercolour under glass which some genius of a framer bonded to craftwood. I had no problems with it until we moved house and it was hung on a wall near a window. Every year I get a furry mold growth on it, as soon as the wet season starts, and I have major dramas having to take it out of the frame, sterilizing the glass, vacuuming the painting, drying it, etc etc..
I have recently found a varnish which is completely invisible, which is especially designed to retard mold growth on anything. I am about to experiment on my watercolour.
cheers Margaret
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Margaret Port
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