Swissgrip non-slip coating

Has anyone used this? What was your experience?

We had it applied to our pressed steel Caroma bath in July last year and since November it's been rubbing off right where we stand to shower. I've been trying to get the installer back to sort it but he hasn't done anything about it. I also contacted the manufacturer direct and waiting to hear what they are going to do about it.

This stuff is expensive and it really does work. The fact that it's peeling off, AND cost close to $500 for just the bottom of the bath (about 450x1600) is infuriating.