Hi Sharon. Thanks for your reply. Since my original post I've had a large gessoed panel, on MDF, crack all over when I applied RSG. The glue pulled the gesso right off the surface.
I always use the same gesso mix, and glue mix. The only variable was the MDF. I'd never use it again. DPI Premium hardboard is the best available in the US, or I use Maple Die Board.
Thanks,
Richard
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