Your 2/2/1 is ok , I would use the turpentine at 10% for the first coat and don't bother using it for the second and third coats. For the second and third coats I use 2/3 paint and 1/3 boiled linseed oil, stir every five minutes. Field marking compound ( as used in on sports fields 40lb for $7.00 ), can be added to the paint to thicken it. To entirely fill the weave adds a lot of weight to the canvas so I draw the line at three coats and am content.

: Does anyone know what one can use to paint canvas (on a yak) to seal the
: weave? I starteed with a marine sandable filler (@ 22.00 a quart) and was
: only able to coat the top. Needing to do the bottom as well and a second
: coat for the entire yak, I sought out the bb here and tried using a combo
: of LINSEED OIL, OIL BASED PRIMER PAINT, AND TURPENTINE in 2/2/1 ratio.
: This recipe yeilds a watery broth that paints well but does not seal the
: gunwale seams of the canvas. I have been following Putz's book on Canvas
: Kayak building and he suggests adding chalk powder and extra dryer. The
: only chalk powder I can find is the type used in chalk lines (blue,
: orange..). Knowing that the recipe will take 2 weeks to dry (as per orders
: of the bb here) I am searching for advice as to thickening my recipe or
: biting the bullet and spending the $90.00 for a gallon of the sandable
: sealer that has a consistency of pancake batter. Advice for the poor would
: be appreciated muchly :o Thanks.... Brian