With the lower thread count, I would guess that it would be difficult siliconizing it yourself. Looks like he only has the red, blue and yellow. The red is the cheapest at $2.85 a yard. Compare that with $5.95
a yard for silnylon. Now factor in the tube of silicon, the big container of mineral spirits, and any other equipment you need to siliconize it.
That is great stuff for a synthetic quilt though!