I've seen solvent based protectors do some strange things Mike
Two cases come to mind:
A blue and "snow" white checkered fabric had the white turn just a bit to the "eggshell" white and it could not be corrected. On new fabric the difference between "snow white" and "eggshell" is, of course, easily noticed by Mrs Customer.
The other was a polyester/acrylic blend print that "bled" after solvent based protector was applied. The cleaner cleaned it with alkaline detergents with no ill effect, but had qualms of conscience when it came to protector and thought he'd use solvent based protector to be on the safe side.
Oops.
You just never know