My experience with Retayne was not good. It's been so long ago I can't remember the particulars. On the other hand, color catchers work, but it is never 100%.
Your inklings are probably correct. Anything that bleeds today will bleed tomorrow. They are still making fabric, so l'd look for another selection. If you sell or gift the quilt, you have no control over the new owner's laundering skills. My luck, it would come back in a heap.