retayne is not going to do you any good at this point- it is a (prewash) agent used to help set hand dyed fabrics- what you need it color catchers (bought in the grocery store in the laundry area- look like dryer sheets) or synthropol which is a laundery additive which keeps fugitive dyes suspended in the water- keeps them from getting on other fabrics in the water.
either product is fine to use on fabrics used to make clothing or bedding. you do need to follow the instructions for them to work correctly. but if you use the retayne now and the red bleeds it will help it (adhere) to the appliques- not keep that from happening---that's the synthropol's function.