"and concerned the acrylic component might turn yellow after a few years?"

Why would you think it would yellow?

I use it and it has not been my experience....

In response to millworkman, I had read that white epoxy grouts turn yellow and while Flexcolor is an acrylic and not an epoxy I was concerned over time, like some plastics, it might turn yellow. So much of what I am reading in regards to white grout is that it all turns yellow over time, especially in showers when exposed to cleaning agents, shampoos, etc. Just don’t want to be disappointed a few years from now :).
Thanks Stonetech for your feedback!

Happy to chime in. Just as a sidebar, a couple of tips....... Cleaning of shower walls & floors should involve the use of a Neutral PH cleaner.

Either have a good fan to dry the enclosure or squeegee or towel off the surfaces.

Try to use only liquid soaps. Most hand soaps use animal-fillers in the product and that tends to leave a residue on surfaces. Only exception I know of is "Dove" bar soap.

Do these simple things and your shower will probably outlive you!

Thank you for the additional insight!