Hi Richard,
Thanks for that. The linen is pre-primed which I cut and stretched myself, as I have been doing so for the past 16 years. It was nice and tight when I originally stretched it months ago. It sagged a bit and I tightened two sides. Now it is sagging again. The sagging isn't obvious, no ripples or buckles it is just very floppy when I paint on it.
Where can I find Alum?
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