Very helpful, thank you. I'll just deal with the marks I've got now, since it sounds like I'll likely only make it worse.

: Hi Smith (?),

: I used the Skinboats.com nylon and goop over a tung oiled frame a
: few years ago. I thinned the first coat of tung oil and thought
: it had dried when I put on the skin. The oil spread out into the
: nylon from the dowels that pinned the ribs!

: So I used washing up liquid and water to try and remove it, rinsing
: out the detergent with more water. I wet the nylon again to
: apply a Jacquard acid dye and to tighten the skin before
: coating.

: I failed to remove the oil stain and have a row of pale patches
: along the gunwale where the stain was resisted. Tried to produce
: a mottled stain so more imperfections didn't really matter. More
: patina. Skin is tight and waterproof.

: Best picture I can find below. This was not the colour I was aiming
: for. :¬)

: . . . . Ben

: (does this help? not sure! anyway)