You will most likely be okay. The thin reel tape stuff LED's is the worst, but it will be a good learning experience for you to witness those types of LED's first hand rather than use it for a paying customer.
Why is it terrible?, because LED's do create a lot of heat unlike the myth that they don't, and like most computers and electronics, heat is the enemy.....the brighter the LED, the more heat. Thin strips do not dissipate heat very well, and putting this tape reel on plastic or HDU, well...you're not going to dissipate heat. My suggestion would be to cut out alum strips or sections and mount the to that to prolong the short life. I would also have this sign on a very short timer to prolong life.
Hanley is okay, it's Chinese, and the only thing that is has going for it that it's Constant Current, BUT...it still is Chinese, and that's the part you can't get away from