Synthrapol or Retayne

I hope I spelled those correctly. Anyways, I'm just about to finish a white and red quilt. I soaked the red in vinegar before I made the quilt, but there is so much work in it I don't want to take a chance on the red bleeding. I found a site that explains when to use which product, and it seems I should use Syntharpol on the finished quilt. Opinions please...
Janell in SE Wisc