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Micheal,
The canvas is commercial and as far as I remember I did not apply additional Gesso. So this explains the pin holes!
The unfinished piece had hung on a wall in a dark, dry room next to the garage (2nd artroom) for about 4 years. I am pretty sure it is not rotting. I did some restoration on early 1900 paintings that went through hardships, before they got to me. The stains don't have the same look, no clouding in the front and no loss or discoloration of pigment either.
I think it is the Liquin that has seeped through. It seems to be more in areas where the stained glass is and I know I that I used thin Liquin washes in those areas. Sort of like you would do watercolor washes. Maybe I used too much medium compared to pigment?!
The question then would be: can a coat of gesso be applied on the back, once the Liquin dries?
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