I also make MX graphics, used a lot of RaceTech and some Acerbis, and it is not the same 'base' as the 'normal' colour plastics. Because they, I guess, have to put something into these fluorescent plastics to be so bright they are also more translucent (see-through like). They do not hold long because of the above mentioned reasons. They tend to brake sooner than the normal ones because they don't feel flexible (in terms of bending) enough after some usage.
But if you are ok with replacing, than its all good. Graphics although are pretty tricky to get for these. As many here use CMYK+++ printers you can't really get that Fluo colour out from print. So you either have to inlay fluo material in between or print on clear, or if you even can't print white you can do clear with inlay of white, which means they are usually a little more expensive.
Also you (or the designer - good designer) need to think of few things. If you have KTM with orange anodised parts (clamps, bolts, hubs, etc,) it will look pretty stupid. Most of these fluo plastics work the best with combination with black (silver) only. Even if you use Fluo orange on KTM with anodised orange part it looks stupid. I had one customer who wanted from me Fluo yellow plastics and graphics, and his KTM is full of orange KTM powerparts as well as the orange frame and it looks pretty bad IMHO.
So just pick up someone good and hopefully you will like it 